US9439925B2 - Methods and compositions for treating wounds utilizing chitosan compounds - Google Patents

Methods and compositions for treating wounds utilizing chitosan compounds Download PDF

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US9439925B2
US9439925B2 US13/639,560 US201113639560A US9439925B2 US 9439925 B2 US9439925 B2 US 9439925B2 US 201113639560 A US201113639560 A US 201113639560A US 9439925 B2 US9439925 B2 US 9439925B2
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wound
alkyl substituted
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chitosan
substituents
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US20130210761A1 (en
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Shenda Baker
William P. Wiesmann
Ruth Baxter
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Synedgen Inc
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Synedgen Inc
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    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K31/00—Medicinal preparations containing organic active ingredients
    • A61K31/70—Carbohydrates; Sugars; Derivatives thereof
    • A61K31/715—Polysaccharides, i.e. having more than five saccharide radicals attached to each other by glycosidic linkages; Derivatives thereof, e.g. ethers, esters
    • A61K31/716—Glucans
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    • A61K47/50—Medicinal preparations characterised by the non-active ingredients used, e.g. carriers or inert additives; Targeting or modifying agents chemically bound to the active ingredient the non-active ingredient being chemically bound to the active ingredient, e.g. polymer-drug conjugates
    • A61K47/51—Medicinal preparations characterised by the non-active ingredients used, e.g. carriers or inert additives; Targeting or modifying agents chemically bound to the active ingredient the non-active ingredient being chemically bound to the active ingredient, e.g. polymer-drug conjugates the non-active ingredient being a modifying agent
    • A61K47/56—Medicinal preparations characterised by the non-active ingredients used, e.g. carriers or inert additives; Targeting or modifying agents chemically bound to the active ingredient the non-active ingredient being chemically bound to the active ingredient, e.g. polymer-drug conjugates the non-active ingredient being a modifying agent the modifying agent being an organic macromolecular compound, e.g. an oligomeric, polymeric or dendrimeric molecule
    • A61K47/61—Medicinal preparations characterised by the non-active ingredients used, e.g. carriers or inert additives; Targeting or modifying agents chemically bound to the active ingredient the non-active ingredient being chemically bound to the active ingredient, e.g. polymer-drug conjugates the non-active ingredient being a modifying agent the modifying agent being an organic macromolecular compound, e.g. an oligomeric, polymeric or dendrimeric molecule the organic macromolecular compound being a polysaccharide or a derivative thereof
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    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
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    • A61L2300/00—Biologically active materials used in bandages, wound dressings, absorbent pads or medical devices
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    • A61L2300/60—Biologically active materials used in bandages, wound dressings, absorbent pads or medical devices characterised by a special physical form
    • A61L2300/64—Animal cells

Definitions

  • the invention relates to soluble chitosans and derivatized chitosans and their use to treat a wound in a subject.
  • compositions comprising soluble chitosans and derivatized chitosans (e.g., liquid, solid particulate and semisolid compositions) and related methods of use are described herein.
  • the derivatized chitosans are water soluble.
  • Exemplary methods using the compositions described herein include, for example, methods of treating a wound (e.g., a chronic wound or burn) in a subject, e.g., the wound is not infected (e.g., bacterially or virally infected) or is infected (e.g., bacterially or virally infected) when treated; methods of treating mucositis or ulceration in a subject that has been treated or is being treated for cancer (e.g., with chemotherapy or radiation therapy), or has been treated or is being treated with immunosuppressive therapy; methods of treating a symptom of a chronic disease (e.g., an inflammatory disorder such as an inflammatory gastrointestinal disorder) in a subject, e.g., a symptom of a chronic disease comprising a wound and/or associated with poor or slow wound healing; methods of treating a wound in a subject, e.g., a wound resulted from an infection and the wound is not infected (e.g., bacterially
  • the composition described herein can result in a synergistic effect when the composition is used to treat a wound in a subject in combination with a second agent.
  • Wound dressings and medical devices comprising soluble chitosans and derivatized chitosans (e.g., liquid, solid particulate and semisolid compositions) and related methods of use are also described herein.
  • the invention features a method of treating a wound, the method comprising administering to a subject an effective amount of a composition comprising a soluble or derivatized chitosan wherein the soluble or derivatized chitosan when administered contacts the wound, thereby treating the wound.
  • the composition reduces the healing time or increases the healing rate of the wound. In some embodiments, the composition decreases the inflammation associated with wound or healing of the wound. In some embodiment, the composition decreases the magnitude or extent of scarring.
  • the subject or wound is not infected, e.g., bacterially or virally infected, when treated with the composition.
  • the subject or wound is infected, e.g., bacterially or virally infected, when treated with the composition.
  • the subject is a human or an animal (e.g., a farm, circus or zoo animal, or a companion pet).
  • an animal e.g., a farm, circus or zoo animal, or a companion pet.
  • the subject has a chronic disease.
  • the chronic disease is selected from the group consisting of inflammatory bowel disease (IBD) (e.g., Crohn's disease), diabetes (e.g., diabetes mellitus types 1 or type 2), chronic kidney disease (CKD), chronic obstructive pulmonary disease (COPD), hypothyroidism, multiple sclerosis, rheumatoid arthritis, hepatic encephalopathy, peritonitis, periodontitis, sinusitis, rhinitis, sepsis, and systemic lupus erythematosus.
  • IBD inflammatory bowel disease
  • diabetes e.g., diabetes mellitus types 1 or type 2
  • COPD chronic obstructive pulmonary disease
  • hypothyroidism e.g., multiple sclerosis, rheumatoid arthritis, hepatic encephalopathy, peritonitis, periodontitis, sinusitis, rhinitis, sepsis
  • the subject has been treated or is being treated with one or more of the cancer therapies, e.g., chemotherapy or radiation therapy.
  • the composition is administered to the subject before, during, or after the subject is treated with the cancer therapy.
  • the composition is administered to the subject prior to the therapy, e.g., for at least about 1 day, 2 days, 3 days, 5 days, or 1 week.
  • the composition is administered to the subject less than about 1 day, 2 days, 4 days, 1 week, 2 weeks, 3 weeks, or 4 weeks after the subject is treated with the cancer therapy.
  • the subject has been treated or is being treated with an immunosuppressive therapy.
  • the composition is administered to the subject prior to the therapy, e.g., for at least about 1 day, 2 days, 3 days, 5 days, or 1 week. In an embodiment, the composition is administered to the subject less than about 1 day, 2 days, 4 days, 1 week, 2 weeks, 3 weeks, or 4 weeks after the subject is treated with the immunosuppressive therapy.
  • the wound is caused by e.g., chemotherapy, radiation therapy, immunosuppressive therapy, chemical damage, biological damage, radiological damage, or immunodeficiency or compromise of immune system (e.g., primary immunodeficiency or acquired immunodeficiency (e.g., AIDS, malnutrition, aging, particular medications (e.g. chemotherapy, disease-modifying antirheumatic drugs, immunosuppressive drugs after organ transplants, glucocorticoids)).
  • chemotherapy radiation therapy
  • immunosuppressive therapy chemical damage, biological damage, radiological damage
  • immunodeficiency or compromise of immune system e.g., primary immunodeficiency or acquired immunodeficiency (e.g., AIDS, malnutrition, aging, particular medications (e.g. chemotherapy, disease-modifying antirheumatic drugs, immunosuppressive drugs after organ transplants, glucocorticoids)).
  • the wound is the result of an infection, e.g., bacterial or viral infection, and wherein the infection is no longer present when the wound is treated.
  • the wound is the result of an infection, e.g., bacterial or viral infection, and wherein the infection is still present when the wound is treated.
  • the wound is an acute wound.
  • the wound is a chronic wound, e.g., a wound that does not heal in an orderly set of stages, in a predictable amount of time, or within three months.
  • the wound is a surgical wound, e.g., a wound resulted from medical grafting (e.g., skin or bone grafting) at the donor site and/or the graft site, or full thickness or partial thickness excision.
  • the wound is a burn.
  • the burn is caused by e.g., heat, electricity, chemicals, light, radiation, or friction.
  • the burn is a first, second, third, or fourth-degree burn.
  • the burn is a superficial, superficial partial-thickness, deep partial-thickness, or full-thickness burn.
  • the burn affects e.g., skin (epidermal tissue and dermis) and/or deeper tissues, e.g., muscle, bone, and blood vessels.
  • the method further comprises administering to the subject a second burn treatment, e.g., antibiotics, stopping the burning process at the source, cooling the burn wound, intravenous fluids, debridement (removing devitalized tissue and contamination), cleaning, dressing (e.g., biosynthetic dressing), pain management (e.g., analgesics (e.g., ibuprofen, acetaminophen), narcotics, local anesthetics), hyperbaric oxygenation, surgical management, control of infection, or control of hyper-metabolic response.
  • the second burn therapy comprises an antibiotic.
  • the composition overcomes (e.g., reduces, decreases, prevents) a deleterious effect of the antibiotic in burn wound healing.
  • the wound is in the epidermis, dermis or hypodermis. In an embodiment, the wound is in the mucosal membrane.
  • the wound is in the eye.
  • the wound is a venous ulcer, a diabetic ulcer, a corneal ulcer (or damage to the corneal epithelium), an oral ulcer, a peptic ulcer, or a pressure ulcer.
  • the composition is administered to the subject less than about 5 minutes, 15 minutes, 30 minutes, 1 hour, 2 hours, 4 hours, 6 hours, 12 hours, 24 hours, 2 days, 3 days, 4 days, 5 days, 6 days, 7 days, 2 weeks, 4 weeks, 2 months, 4 months, 6 months, 8 months, 10 months, or 1 year after the subject is wounded.
  • the healing time of the wound (e.g., the length of one or more of the inflammatory, proliferative, or remodeling phase of wound healing) is reduced by at least about 10%, 20%, 30%, 40%, 50%, 60%, 70%, 80%, 90%, or 95%, compared to the healing time of the wound (e.g., the length of one or more of the inflammatory, proliferative, or remodeling phase of wound healing) that has not been contacted with the soluble or derivatized chitosan.
  • the wound healing rate (e.g., the absolute area healed per day, the percentage of initial area healed per day, or the greatest average wound margin distance from the wound centre divided by the time to complete wound closure) is increased by at least about 1, 2, 3, 4, 5, 6, 7, 8, 9, or 10 fold, compared to the healing rate of the wound that has not been contacted with the soluble or derivatized chitosan.
  • the method further comprises administering to the subject a second wound therapy, e.g., antibiotic or antibacterial use, debridement, irrigation, negative pressure wound therapy (vacuum-assisted closure), warming, oxygenation, moist wound healing, removing mechanical stress, and/or adding cells (e.g., keratinocytes) or other materials (e.g., artificial skin substitutes that have fibroblasts and/or keratinocytes in a matrix of collagen) to secrete or enhance levels of healing factors (e.g., vascular endothelial growth factor (VEGF), insulin-like growth factor (IGF), platelet-derived growth factor (PDGF), transforming growth factor- ⁇ (TGF- ⁇ ), and epidermal growth factor (EGF)).
  • a second wound therapy e.g., antibiotic or antibacterial use, debridement, irrigation, negative pressure wound therapy (vacuum-assisted closure), warming, oxygenation, moist wound healing, removing mechanical stress, and/or adding cells (e.g., ker
  • the second wound therapy comprises a negative pressure wound therapy (vacuum-assisted closure).
  • the second wound therapy comprises an antibiotic.
  • the composition overcomes (e.g., reduces, decreases, prevents) a deleterious effect of the antibiotic in wound healing.
  • the second wound therapy comprises a steroidal or non-steroidal anti-inflammatory drug (NSIAD).
  • the composition acts additively or synergysically with the steroidal or non-steroidal anti-inflammatory drug.
  • the composition is administered topically or orally, e.g., by topical rinse, gel, spray, oral, enema, inhalation, dry powder, aerosolized liquid, aerosolized powder, or eye drop.
  • the composition is administered orally to treat a wound (e.g., damaged mucosa) in the gastrointestinal tract and/or an inflammatory gastrointestinal disorder.
  • the composition is administered topically to treat a wound and/or reduce or prevent a scar, e.g., in the eye.
  • the composition is administered before, during or after one or more of the wound healing phase, e.g., inflammatory, proliferative, or remodeling phases.
  • the wound healing phase e.g., inflammatory, proliferative, or remodeling phases.
  • the effective amount is therapeutically effective amount.
  • the soluble or derivatized chitosan is soluble in aqueous solution from about pH 6.8 to about pH 7.4.
  • the soluble or derivatized chitosan is soluble in aqueous solution from about pH 3 to about pH 9.
  • the soluble or derivatized chitosan is soluble in aqueous solution from about pH 5.0 to about pH 6.0, e.g., in wounds or duodenum.
  • the soluble or derivatized chitosan is soluble in aqueous solution from about pH 2.0 to about pH 4.0, e.g., in stomach.
  • the soluble or derivatized chitosan is soluble in aqueous solution from about pH 8.0 to about pH 8.5, e.g., in lower part of the gastrointestinal tract.
  • the soluble chitosan is underivatized.
  • the derivatized chitosan comprises a chitosan of the following formula (I):
  • n is an integer between 20 and 6000;
  • each R 1 is independently selected for each occurrence from hydrogen, acetyl, and either:
  • R 2 is hydrogen or amino
  • R 3 is amino, guanidino, C 1 -C 6 alkyl substituted with an amino or guanidino moiety, or a natural or unnatural amino acid side chain; or
  • R 1 substituents are H, at least 1% of R 1 substituents are acetyl, and at least 2% of R 1 substituents are a group of formula (II) or are taken together with the nitrogen to which they are attached to form a guanidine moiety.
  • the derivatized chitosan comprises of the following formula (I) wherein at least 90% by number or weight of R 1 moieties are as defined in formula (I) (e.g., at least about 95%, at least about 96%, at least about 97%, at least about 98%, or at least about 99%):
  • n is an integer between 20 and 6000;
  • each R 1 is independently selected for each occurrence from hydrogen, acetyl, and either:
  • R 2 is hydrogen or amino
  • R 3 is amino, guanidino, C 1 -C 6 alkyl substituted with an amino or guanidino moiety, or a natural or unnatural amino acid side chain; or
  • R 1 substituents are H, at least 1% of R 1 substituents are acetyl, and at least 2% of R 1 substituents are a group of formula (II) or are taken together with the nitrogen to which they are attached to form a guanidine moiety.
  • R 1 substituents are hydrogen.
  • R 1 substituents are hydrogen.
  • R 1 substituents are acetyl.
  • R 1 substituents are acetyl.
  • R 1 substituents are a group of formula (II).
  • R 1 substituents are a group of formula (II).
  • R 1 substituents are hydrogen, 4-20% of R 1 substituents are acetyl, 4-30% of R 1 substituents are a group of formula (II).
  • R 2 is amino and R 3 is an arginine side chain.
  • R 1 is selected from one of the following:
  • R 2 is amino and R 3 is a lysine side chain.
  • R 1 is selected from one of the following:
  • R 2 is amino and R 3 is a histidine side chain.
  • R 1 is selected from one of the following:
  • At least 1% of R 1 substituents are selected from one of the following:
  • R 1 substituents are selected from the following:
  • R 2 is amino and R 3 is a substituted C 1 -C 6 alkyl.
  • R 3 is C 1 -C 6 alkyl substituted with an amino group.
  • R 3 is C 1 alkyl substituted with an amino group.
  • R 3 is C 2 alkyl substituted with an amino group.
  • R 3 is C 3 alkyl substituted with an amino group.
  • R 3 is C 4 alkyl substituted with an amino group.
  • R 3 is C 5 alkyl substituted with an amino group.
  • R 3 is C 6 alkyl substituted with an amino group.
  • R 1 is selected from one of the following:
  • R 3 is C 1 -C 6 alkyl substituted with a guanidino group.
  • R 3 is C 1 alkyl substituted with a guanidino group.
  • R 3 is C 2 alkyl substituted with a guanidino group.
  • R 3 is C 3 alkyl substituted with a guanidino group.
  • R 3 is C 4 alkyl substituted with a guanidino group.
  • R 3 is C 5 alkyl substituted with a guanidino group.
  • R 3 is C 6 alkyl substituted with a guanidino group.
  • R 1 is selected from one of the following:
  • R 2 is amino that is substituted with a nitrogen protecting group prior to substitution on chitosan and removed subsequent to substitution on chitosan.
  • the nitrogen protecting group is tert-butyloxycarbonyl (Boc).
  • a nitrogen protecting group is used, which can provide an intermediate polymer having a nitrogen protecting group such as Boc.
  • R 2 is amino
  • R 2 is hydrogen and R 3 is amino.
  • R 2 is hydrogen and R 3 is guanidino.
  • R 2 is hydrogen and R 3 is a substituted C 1 -C 6 alkyl.
  • R 3 is C 1 -C 6 alkyl substituted with an amino group.
  • R 3 is C 1 alkyl substituted with an amino group.
  • R 3 is C 2 alkyl substituted with an amino group.
  • R 3 is C 3 alkyl substituted with an amino group.
  • R 3 is C 4 alkyl substituted with an amino group.
  • R 3 is C 5 alkyl substituted with an amino group.
  • R 3 is C 6 alkyl substituted with an amino group.
  • R 1 is selected from one of the following:
  • R 3 is C 1 -C 6 alkyl substituted with a guanidino group.
  • R 3 is C 1 alkyl substituted with a guanidino group.
  • R 3 is C 2 alkyl substituted with a guanidino group.
  • R 3 is C 3 alkyl substituted with a guanidino group.
  • R 3 is C 4 alkyl substituted with a guanidino group.
  • R 3 is C 5 alkyl substituted with a guanidino group.
  • R 3 is C 6 alkyl substituted with a guanidino group.
  • R 1 is selected from one of the following:
  • R 1 substituents are H, at least 1% of R 1 substituents are acetyl, and at least 2% of R 1 substituents independently selected from any of the formulae specifically shown above.
  • the functionalized chitosan of formula (I) may be further derivatized on the free hydroxyl moieties.
  • the molecular weight of the functionalized chitosan is between 5,000 and 1,000,000 Da.
  • the molecular weight of the functionalized chitosan is between 10,000 and 350,000 Da.
  • the molecular weight of the functionalized chitosan is between 10,000 and 60,000 Da.
  • the molecular weight of the functionalized chitosan is between 15,000 and 45,000 Da.
  • the molecular weight of the functionalized chitosan is between 15,000 and 35,000 Da.
  • the molecular weight of the functionalized chitosan is between 15,000 and 25,000 Da.
  • the functionalized chitosan is soluble in aqueous solution between pH 6 and 8.
  • the functionalized chitosan is soluble in aqueous solution between pH 6.8 and pH 7.4.
  • the chitosan is functionalized at between 5% and 50%.
  • the chitosan is functionalized at between 20% and 30%.
  • the degree of deacetylation (% DDA) of the derivatized chitosan is between 75% and 95%.
  • the degree of deacetylation (% DDA) of the derivatized chitosan is between 80% and 90%.
  • the polydispersity index (PDI) of the derivatized chitosan is between 1.0 and 2.5.
  • the polydispersity index (PDI) of the derivatized chitosan is between 1.2 and 1.8.
  • the functionalized chitosan is substantially free of other impurities.
  • the invention features a method of treating mucositis or ulceration, or a symptom of mucositis or ulceration, the method comprising administering to a subject an effective amount of a composition comprising a soluble or derivatized chitosan, thereby treating mucositis or ulceration, or the symptom of mucositis or ulceration.
  • the subject has been treated or is being treated for cancer with chemotherapy (e.g., 5-fluorouracil (5-FU), irinotecan, or melphalan hydrochloride), or radiation therapy.
  • chemotherapy e.g., 5-fluorouracil (5-FU), irinotecan, or melphalan hydrochloride
  • the subject has been treated or is being treated with immunosuppressive therapy.
  • the subject has been treated or is being treated with radiation therapy.
  • the mucositis or ulceration occurs, e.g., in the gastrointestinal (GI) tract, e.g., mouth, tongue, throat, sinus, esophagus, stomach, large or small intestine.
  • GI gastrointestinal
  • the symptom of mucositis comprises thinning of the mucosal lining, inflammation, ulceration, peripheral erythema, pain, and/or dysgeusia.
  • mucositis or ulceration is the result of an infection, e.g., bacterial or viral infection, and wherein the infection is no longer present when mucositis is treated.
  • mucositis or ulceration is the result of an infection, e.g., bacterial or viral infection, and wherein the infection is present when mucositis is treated.
  • the composition reduces the severity of mucositis (e.g., oral mucositis) by at least 1, 2, 3 or 4 grades, e.g., based on the World Health Organization (WHO) Oral Toxicity score, the National Cancer Institute Common Toxicity Criteria (NCI-CTC) for Oral Mucositis, or the Oral Mucositis Assessment Scale (OMAS).
  • WHO World Health Organization
  • NCI-CTC National Cancer Institute Common Toxicity Criteria
  • OFS Oral Mucositis Assessment Scale
  • the composition reduces the healing time or increases the healing rate of mucositis or ulceration, for example, relative to control or standard of care. In some embodiments, the composition decreases the inflammation associated with mucositis or ulceration or healing of the mucositis or ulceration.
  • the healing time of mucositis e.g., the length of one or more of the initiation, message generation, signaling and amplification, ulceration, or healing phase of mucositis
  • ulceration is reduced by at least about 10%, 20%, 30%, 40%, 50%, 60%, 70%, 80%, 90%, or 95%, compared to the healing time of mucositis that has not been contacted with the soluble or derivatized chitosan.
  • the composition is administered to the subject before, during, or after the subject is treated with the cancer therapy.
  • the composition is administered to the subject prior to the therapy, e.g., for at least about 1 day, 2 days, 3 days, 5 days, or 1 week.
  • the composition is administered to the subject less than about 1 day, 2 days, 3 days, 4 days, 5 days, 6 days, 1 week, 2 weeks, 3 weeks, or 4 weeks after the subject is treated with the cancer therapy.
  • the method further comprises administering to the subject a second mucositis therapy, e.g., antibiotics, oral hygiene, water-soluble jellies, salt mouthwash, keratinocyte growth factor (KGF), cytokines or modifier of inflammation (e.g., IL-1, IL-10, IL-11, TGF- ⁇ ), amino acid supplementation (e.g., glutamine), vitamin, colony-stimulating factor (CSF), cryotherapy, laser therapy, barrier protection agent (e.g., concentrated oral gel product (e.g., GELCLAIR®), or medicinal mouthwash (e.g., CAPHOSOL®, MUGARD®).
  • a second mucositis therapy e.g., antibiotics, oral hygiene, water-soluble jellies, salt mouthwash, keratinocyte growth factor (KGF), cytokines or modifier of inflammation (e.g., IL-1, IL-10, IL-11, TGF- ⁇ ), amino acid supplementation (e.g., glutamine), vitamin,
  • the second mucositis therapy comprises an antibiotic.
  • the composition overcomes (e.g., reduces, decreases, prevents) a deleterious effect of the antibiotic in the healing of mucositis.
  • the second mucositis therapy comprises a steroid.
  • the composition acts additively or synergistically with the steroid to reduce inflammation and increase the healing in mucositis.
  • the composition is administered topically or orally, e.g., by topical rinse, gel, spray, oral, enema, inhalation, dry powder, aerosolized liquid, aerosolized powder, or eye drop.
  • the composition is administered orally to treat a wound (e.g., damaged mucosa) in the gastrointestinal tract and/or an inflammatory gastrointestinal disorder.
  • the composition is administered topically to treat a wound and/or reduce or prevent a scar, e.g., in the eye.
  • the composition is administered before, during or after one or more of the healing phase of mucositis, e.g., initiation, message generation, signaling and amplification, ulceration, or healing phase.
  • the healing phase of mucositis e.g., initiation, message generation, signaling and amplification, ulceration, or healing phase.
  • the effective amount is therapeutically effective amount.
  • the soluble or derivatized chitosan is soluble in aqueous solution from about pH 6.8 to about pH 7.4.
  • the soluble or derivatized chitosan is soluble in aqueous solution from about pH 3 to about pH 9.
  • the soluble or derivatized chitosan is soluble in aqueous solution from about pH 5.0 to about pH 6.0, e.g., in wounds or duodenum.
  • the soluble or derivatized chitosan is soluble in aqueous solution from about pH 2.0 to about pH 4.0, e.g., in stomach.
  • the soluble or derivatized chitosan is soluble in aqueous solution from about pH 8.0 to about pH 8.5, e.g., in lower part of the gastrointestinal tract.
  • the soluble chitosan is underivatized.
  • the derivatized chitosan comprises a chitosan of the following formula (I):
  • n is an integer between 20 and 6000;
  • each R 1 is independently selected for each occurrence from hydrogen, acetyl, and either:
  • R 2 is hydrogen or amino
  • R 3 is amino, guanidino, C 1 -C 6 alkyl substituted with an amino or guanidino moiety, or a natural or unnatural amino acid side chain; or
  • R 1 substituents are H, at least 1% of R 1 substituents are acetyl, and at least 2% of R 1 substituents are a group of formula (II) or are taken together with the nitrogen to which they are attached to form a guanidine moiety.
  • the derivatized chitosan comprises of the following formula (I) wherein at least 90% by number or weight of R 1 moieties are as defined in formula (I) (e.g., at least about 95%, at least about 96%, at least about 97%, at least about 98%, or at least about 99%):
  • n is an integer between 20 and 6000;
  • each R 1 is independently selected for each occurrence from hydrogen, acetyl, and either:
  • R 2 is hydrogen or amino
  • R 3 is amino, guanidino, C 1 -C 6 alkyl substituted with an amino or guanidino moiety, or a natural or unnatural amino acid side chain; or
  • R 1 substituents are H, at least 1% of R 1 substituents are acetyl, and at least 2% of R 1 substituents are a group of formula (II) or are taken together with the nitrogen to which they are attached to form a guanidine moiety.
  • R 1 substituents are hydrogen.
  • R 1 substituents are hydrogen.
  • R 1 substituents are acetyl.
  • R 1 substituents are acetyl.
  • R 1 substituents are a group of formula (II).
  • R 1 substituents are a group of formula (II).
  • R 1 substituents are hydrogen, 4-20% of R 1 substituents are acetyl, 4-30% of R 1 substituents are a group of formula (II).
  • R 2 is amino and R 3 is an arginine side chain.
  • R 1 is selected from one of the following:
  • R 2 is amino and R 3 is a lysine side chain.
  • R 1 is selected from one of the following:
  • R 2 is amino and R 3 is a histidine side chain.
  • R 1 is selected from one of the following:
  • At least 1% of R 1 substituents are selected from one of the following:
  • R 1 substituents are selected from the following:
  • R 2 is amino and R 3 is a substituted C 1 -C 6 alkyl.
  • R 3 is C 1 -C 6 alkyl substituted with an amino group.
  • R 3 is C 1 alkyl substituted with an amino group.
  • R 3 is C 2 alkyl substituted with an amino group.
  • R 3 is C 3 alkyl substituted with an amino group.
  • R 3 is C 4 alkyl substituted with an amino group.
  • R 3 is C 5 alkyl substituted with an amino group.
  • R 3 is C 6 alkyl substituted with an amino group.
  • R 1 is selected from one of the following:
  • R 3 is C 1 -C 6 alkyl substituted with a guanidino group.
  • R 3 is C 1 alkyl substituted with a guanidino group.
  • R 3 is C 2 alkyl substituted with a guanidino group.
  • R 3 is C 3 alkyl substituted with a guanidino group.
  • R 3 is C 4 alkyl substituted with a guanidino group.
  • R 3 is C 5 alkyl substituted with a guanidino group.
  • R 3 is C 6 alkyl substituted with a guanidino group.
  • R 1 is selected from one of the following:
  • R 2 is amino that is substituted with a nitrogen protecting group prior to substitution on chitosan and removed subsequent to substitution on chitosan.
  • the nitrogen protecting group is tert-butyloxycarbonyl (Boc).
  • a nitrogen protecting group is used, which can provide an intermediate polymer having a nitrogen protecting group such as Boc.
  • R 2 is amino
  • R 2 is hydrogen and R 3 is amino.
  • R 2 is hydrogen and R 3 is guanidino.
  • R 2 is hydrogen and R 3 is a substituted C 1 -C 6 alkyl.
  • R 3 is C 1 -C 6 alkyl substituted with an amino group.
  • R 3 is C 1 alkyl substituted with an amino group.
  • R 3 is C 2 alkyl substituted with an amino group.
  • R 3 is C 3 alkyl substituted with an amino group.
  • R 3 is C 4 alkyl substituted with an amino group.
  • R 3 is C 5 alkyl substituted with an amino group.
  • R 3 is C 6 alkyl substituted with an amino group.
  • R 1 is selected from one of the following:
  • R 3 is C 1 -C 6 alkyl substituted with a guanidino group.
  • R 3 is C 1 alkyl substituted with a guanidino group.
  • R 3 is C 2 alkyl substituted with a guanidino group.
  • R 3 is C 3 alkyl substituted with a guanidino group.
  • R 3 is C 4 alkyl substituted with a guanidino group.
  • R 3 is C 5 alkyl substituted with a guanidino group.
  • R 3 is C 6 alkyl substituted with a guanidino group.
  • R 1 is selected from one of the following:
  • R 1 substituents are H, at least 1% of R 1 substituents are acetyl, and at least 2% of R 1 substituents independently selected from any of the formulae specifically shown above.
  • the functionalized chitosan of formula (I) may be further derivatized on the free hydroxyl moieties.
  • the molecular weight of the functionalized chitosan is between 5,000 and 1,000,000 Da.
  • the molecular weight of the functionalized chitosan is between 10,000 and 350,000 Da.
  • the molecular weight of the functionalized chitosan is between 10,000 and 60,000 Da.
  • the molecular weight of the functionalized chitosan is between 15,000 and 45,000 Da.
  • the molecular weight of the functionalized chitosan is between 15,000 and 35,000 Da.
  • the molecular weight of the functionalized chitosan is between 15,000 and 25,000 Da.
  • the functionalized chitosan is soluble in aqueous solution between pH 6 and 8.
  • the functionalized chitosan is soluble in aqueous solution between pH 6.8 and pH 7.4.
  • the chitosan is functionalized at between 5% and 50%.
  • the chitosan is functionalized at between 20% and 30%.
  • the degree of deacetylation (% DDA) of the derivatized chitosan is between 75% and 95%.
  • the degree of deacetylation (% DDA) of the derivatized chitosan is between 80% and 90%.
  • the polydispersity index (PDI) of the derivatized chitosan is between 1.0 and 2.5.
  • the polydispersity index (PDI) of the derivatized chitosan is between 1.2 and 1.8.
  • the functionalized chitosan is substantially free of other impurities.
  • the invention features a method of treating a symptom of a chronic disease, the method comprising administering to a subject an effective amount of a composition comprising a soluble or derivatized chitosan, thereby treating the symptom of the chronic disease.
  • the symptom of the chronic disease comprises at least one wound. In an embodiment, the chronic disease is associated with poor or slow wound healing.
  • the chronic disease is selected from the group consisting of inflammatory bowel disease (IBD) (e.g., Crohn's disease), diabetes (e.g., diabetes mellitus types 1 or type 2), chronic kidney disease (CKD), chronic obstructive pulmonary disease (COPD), hypothyroidism, multiple sclerosis, rheumatoid arthritis, sinusitis, rhinitis, sepsis, peritonitis, periodontitis, hepatic encephalopathy, and systemic lupus erythematosus.
  • IBD inflammatory bowel disease
  • diabetes e.g., diabetes mellitus types 1 or type 2
  • COPD chronic obstructive pulmonary disease
  • hypothyroidism e.g., multiple sclerosis
  • rheumatoid arthritis e.g., sinusitis, rhinitis, sepsis, peritonitis, periodontitis, hepatic encephalopathy, and systemic
  • the subject has a wound.
  • the wound is an acute wound.
  • the wound is a chronic wound, e.g., a wound that does not heal in an orderly set of stages, in a predictable amount of time, or within three months.
  • the wound is a surgical wound, e.g., a wound resulted from medical grafting (e.g., skin or bone grafting) at the donor site and/or the graft site, full thickness or partial thickness excision.
  • the wound is a burn wound.
  • the wound is in the epidermis, dermis or hypodermis.
  • the wound is in the mucosal membrane.
  • the wound is a venous ulcer, a diabetic ulcer, corneal ulcer (or damage to the corneal epithelium), an oral ulcer, a peptic ulcer, or a pressure ulcer.
  • the wound is the result of an infection, e.g., bacterial or viral infection, and wherein the infection is no longer present when the wound is treated.
  • the wound is the result of an infection, e.g., bacterial or viral infection, and wherein the infection is still present when the wound is treated.
  • the composition is administered to the subject less than about 5 minutes, 15 minutes, 30 minutes, 1 hour, 2 hours, 4 hours, 6 hours, 12 hours, 24 hours, 2 days, 3 days, 4 days, 5 days, 6 days, 7 days, 2 weeks, 4 weeks, 2 months, 4 months, 6 months, 8 months, 10 months, or 1 year after the subject is wounded.
  • the composition reduces the healing time or increase the healing rate of the wound. In some embodiments, the composition decreases the inflammation associated with wound or healing of the wound.
  • the healing time of the wound (e.g., the length of one or more of the inflammatory, proliferative, or remodeling phase of wound healing) is reduced by at least about 10%, 20%, 30%, 40%, 50%, 60%, 70%, 80%, 90%, or 95%, compared to the healing time of the wound (e.g., the length of one or more of the inflammatory, proliferative, or remodeling phase of wound healing) that has not been contacted with the soluble or derivatized chitosan.
  • the wound healing rate (e.g., the absolute area healed per day, the percentage of initial area healed per day, or the greatest average wound margin distance from the wound centre divided by the time to complete wound closure) is increased by at least about 1, 2, 3, 4, 5, 6, 7, 8, 9, or 10 fold, compared to the healing rate of the wound that has not been contacted with the soluble or derivatized chitosan.
  • the method further comprises administering to the subject a second wound therapy, e.g., antibiotic or antibacterial use, debridement, irrigation, negative pressure wound therapy (vacuum-assisted closure), warming, oxygenation, moist wound healing, removing mechanical stress, and/or adding cells (e.g., keratinocytes) or other materials (e.g., artificial skin substitutes that have fibroblasts and/or keratinocytes in a matrix of collagen) to secrete or enhance levels of healing factors (e.g., vascular endothelial growth factor (VEGF), insulin-like growth factor (IGF), platelet-derived growth factor (PDGF), transforming growth factor- ⁇ (TGF- ⁇ ), and epidermal growth factor (EGF)).
  • a second wound therapy e.g., antibiotic or antibacterial use, debridement, irrigation, negative pressure wound therapy (vacuum-assisted closure), warming, oxygenation, moist wound healing, removing mechanical stress, and/or adding cells (e.g., ker
  • the second wound therapy comprises a negative pressure wound therapy (vacuum-assisted closure).
  • the second wound therapy comprises an antibiotic.
  • the composition overcomes (e.g., reduces, decreases, prevents) a deleterious effect of the antibiotic in wound healing.
  • the second wound therapy comprises a steroidal or non-steroidal anti-inflammatory drug (NSIAD).
  • the composition acts additively or synergysically with the steroidal or non-steroidal anti-inflammatory drug.
  • the composition is administered topically or orally, e.g., by topical rinse, gel, spray, oral, enema, inhalation, dry powder, aerosolized liquid, aerosolized powder, or eye drop.
  • the composition is administered orally to treat a wound (e.g., damaged mucosa) in the gastrointestinal tract and/or an inflammatory gastrointestinal disorder.
  • the composition is administered topically to treat a wound and/or reduce or prevent a scar, e.g., in the eye.
  • the composition is administered before, during or after one or more of the wound healing phase, e.g., inflammatory, proliferative, or remodeling phase.
  • the wound healing phase e.g., inflammatory, proliferative, or remodeling phase.
  • the effective amount is therapeutically effective amount.
  • the soluble or derivatized chitosan is soluble in aqueous solution from about pH 6.8 to about pH 7.4.
  • the soluble or derivatized chitosan is soluble in aqueous solution from about pH 3 to about pH 9.
  • the soluble or derivatized chitosan is soluble in aqueous solution from about pH 5.0 to about pH 6.0, e.g., in wounds or duodenum.
  • the soluble or derivatized chitosan is soluble in aqueous solution from about pH 2.0 to about pH 4.0, e.g., in stomach.
  • the soluble or derivatized chitosan is soluble in aqueous solution from about pH 8.0 to about pH 8.5, e.g., in lower part of the gastrointestinal tract.
  • the derivatized chitosan comprises a chitosan of the following formula (I):
  • n is an integer between 20 and 6000;
  • each R 1 is independently selected for each occurrence from hydrogen, acetyl, and either:
  • R 2 is hydrogen or amino
  • R 3 is amino, guanidino, C 1 -C 6 alkyl substituted with an amino or guanidino moiety, or a natural or unnatural amino acid side chain; or
  • R 1 substituents are H, at least 1% of R 1 substituents are acetyl, and at least 2% of R 1 substituents are a group of formula (II) or are taken together with the nitrogen to which they are attached to form a guanidine moiety.
  • the derivatized chitosan comprises of the following formula (I) wherein at least 90% by number or weight of R 1 moieties are as defined in formula (I) (e.g., at least about 95%, at least about 96%, at least about 97%, at least about 98%, or at least about 99%):
  • n is an integer between 20 and 6000;
  • each R 1 is independently selected for each occurrence from hydrogen, acetyl, and either:
  • R 2 is hydrogen or amino
  • R 3 is amino, guanidino, C 1 -C 6 alkyl substituted with an amino or guanidino moiety, or a natural or unnatural amino acid side chain; or
  • R 1 substituents are H, at least 1% of R 1 substituents are acetyl, and at least 2% of R 1 substituents are a group of formula (II) or are taken together with the nitrogen to which they are attached to form a guanidine moiety.
  • R 1 substituents are hydrogen.
  • R 1 substituents are hydrogen.
  • R 1 substituents are acetyl.
  • R 1 substituents are acetyl.
  • R 1 substituents are a group of formula (II).
  • R 1 substituents are a group of formula (II).
  • R 1 substituents are hydrogen, 4-20% of R 1 substituents are acetyl, 4-30% of R 1 substituents are a group of formula (II).
  • R 2 is amino and R 3 is an arginine side chain.
  • R 1 is selected from one of the following:
  • R 2 is amino and R 3 is a lysine side chain.
  • R 1 is selected from one of the following:
  • R 2 is amino and R 3 is a histidine side chain.
  • R 1 is selected from one of the following:
  • At least 1% of R 1 substituents are selected from one of the following:
  • R 1 substituents are selected from the following:
  • R 2 is amino and R 3 is a substituted C 1 -C 6 alkyl.
  • R 3 is C 1 -C 6 alkyl substituted with an amino group.
  • R 3 is C 1 alkyl substituted with an amino group.
  • R 3 is C 2 alkyl substituted with an amino group.
  • R 3 is C 3 alkyl substituted with an amino group.
  • R 3 is C 4 alkyl substituted with an amino group.
  • R 3 is C 5 alkyl substituted with an amino group.
  • R 3 is C 6 alkyl substituted with an amino group.
  • R 1 is selected from one of the following:
  • R 3 is C 1 -C 6 alkyl substituted with a guanidino group.
  • R 3 is C 1 alkyl substituted with a guanidino group.
  • R 3 is C 2 alkyl substituted with a guanidino group.
  • R 3 is C 3 alkyl substituted with a guanidino group.
  • R 3 is C 4 alkyl substituted with a guanidino group.
  • R 3 is C 5 alkyl substituted with a guanidino group.
  • R 3 is C 6 alkyl substituted with a guanidino group.
  • R 1 is selected from one of the following:
  • R 2 is amino that is substituted with a nitrogen protecting group prior to substitution on chitosan and removed subsequent to substitution on chitosan.
  • the nitrogen protecting group is tert-butyloxycarbonyl (Boc).
  • a nitrogen protecting group is used, which can provide an intermediate polymer having a nitrogen protecting group such as Boc.
  • R 2 is amino
  • R 2 is hydrogen and R 3 is amino.
  • R 2 is hydrogen and R 3 is guanidino.
  • R 2 is hydrogen and R 3 is a substituted C 1 -C 6 alkyl.
  • R 3 is C 1 -C 6 alkyl substituted with an amino group.
  • R 3 is C 1 alkyl substituted with an amino group.
  • R 3 is C 2 alkyl substituted with an amino group.
  • R 3 is C 3 alkyl substituted with an amino group.
  • R 3 is C 4 alkyl substituted with an amino group.
  • R 3 is C 5 alkyl substituted with an amino group.
  • R 3 is C 6 alkyl substituted with an amino group.
  • R 1 is selected from one of the following:
  • R 3 is C 1 -C 6 alkyl substituted with a guanidino group.
  • R 3 is C 1 alkyl substituted with a guanidino group.
  • R 3 is C 2 alkyl substituted with a guanidino group.
  • R 3 is C 3 alkyl substituted with a guanidino group.
  • R 3 is C 4 alkyl substituted with a guanidino group.
  • R 3 is C 5 alkyl substituted with a guanidino group.
  • R 3 is C 6 alkyl substituted with a guanidino group.
  • R 1 is selected from one of the following:
  • R 1 substituents are H, at least 1% of R 1 substituents are acetyl, and at least 2% of R 1 substituents independently selected from any of the formulae specifically shown above.
  • the functionalized chitosan of formula (I) may be further derivatized on the free hydroxyl moieties.
  • the molecular weight of the functionalized chitosan is between 5,000 and 1,000,000 Da.
  • the molecular weight of the functionalized chitosan is between 10,000 and 350,000 Da.
  • the molecular weight of the functionalized chitosan is between 10,000 and 60,000 Da.
  • the molecular weight of the functionalized chitosan is between 15,000 and 45,000 Da.
  • the molecular weight of the functionalized chitosan is between 15,000 and 35,000 Da.
  • the molecular weight of the functionalized chitosan is between 15,000 and 25,000 Da.
  • the functionalized chitosan is soluble in aqueous solution between pH 6 and 8.
  • the functionalized chitosan is soluble in aqueous solution between pH 6.8 and pH 7.4.
  • the chitosan is functionalized at between 5% and 50%.
  • the chitosan is functionalized at between 20% and 30%.
  • the degree of deacetylation (% DDA) of the derivatized chitosan is between 75% and 95%.
  • the degree of deacetylation (% DDA) of the derivatized chitosan is between 80% and 90%.
  • the polydispersity index (PDI) of the derivatized chitosan is between 1.0 and 2.5.
  • the polydispersity index (PDI) of the derivatized chitosan is between 1.2 and 1.8
  • the functionalized chitosan is substantially free of other impurities.
  • the invention features a method of treating a wound in a subject, wherein the wound is a result of an acute or chronic infection, the method comprising administering to a subject an effective amount of a composition comprising a soluble or derivatized chitosan, thereby treating the wound.
  • the subject or the wound is no longer infected (e.g., bacterial or viral infected) when treated with the composition. In an embodiment, the subject or the wound is infected (e.g., bacterial or viral infected) when treated with the composition.
  • the subject has a chronic disease, e.g., inflammatory bowel disease (IBD) (e.g., Crohn's disease), diabetes (e.g., diabetes mellitus types 1 or type 2), chronic kidney disease (CKD), chronic obstructive pulmonary disease (COPD), hypothyroidism, multiple sclerosis, rheumatoid arthritis, peritonitis, periodontitis, sinusitis, rhinitis, sepsis, hepatic encephalopathy, and systemic lupus erythematosus.
  • IBD inflammatory bowel disease
  • diabetes e.g., diabetes mellitus types 1 or type 2
  • CKD chronic kidney disease
  • COPD chronic obstructive pulmonary disease
  • hypothyroidism e.g., multiple sclerosis, rheumatoid arthritis, peritonitis, periodontitis, sinusitis, rhinitis, sepsis, hepatic encephal
  • the wound is in the epidermis, dermis or hypodermis. In an embodiment, the wound is in the mucosal membrane.
  • the wound is a venous ulcer, a diabetic ulcer, a corneal ulcer (or damage to the corneal epithelium), an oral ulcer, a peptic ulcer, or a pressure ulcer.
  • the composition is administered to the subject less than about 5 minutes, 15 minutes, 30 minutes, 1 hour, 2 hours, 4 hours, 6 hours, 12 hours, 24 hours, 2 days, 3 days, 4 days, 5 days, 6 days, 7 days, 2 weeks, 4 weeks, 2 months, 4 months, 6 months, 8 months, 10 months, or 1 year after the subject is wounded.
  • the composition is administered to the subject prior to mucosal damage, e.g., for at least about 1 day, 2 days, 3 days, 5 days, or 1 week.
  • the composition reduces the healing time or increase the healing rate of the wound. In some embodiments, the composition decreases the inflammation associated with wound or healing of the wound.
  • the healing time of the wound (e.g., the length of one or more of the inflammatory, proliferative, or remodeling phase of wound healing) is reduced by at least about 10%, 20%, 30%, 40%, 50%, 60%, 70%, 80%, 90%, or 95%, compared to the healing time of the wound (e.g., the length of one or more of the inflammatory, proliferative, or remodeling phase of wound healing) that has not been contacted with the soluble or derivatized chitosan.
  • the wound healing rate (e.g., the absolute area healed per day, the percentage of initial area healed per day, or the greatest average wound margin distance from the wound centre divided by the time to complete wound closure) is increased by at least about 1, 2, 3, 4, 5, 6, 7, 8, 9, or 10 fold, compared to the healing rate of the wound that has not been contacted with the soluble or derivatized chitosan.
  • the method further comprises administering to the subject a second wound therapy, e.g., antibiotic or antibacterial use, debridement, irrigation, negative pressure wound therapy (vacuum-assisted closure), warming, oxygenation, moist wound healing, removing mechanical stress, and/or adding cells (e.g., keratinocytes) or other materials (e.g., artificial skin substitutes that have fibroblasts and/or keratinocytes in a matrix of collagen) to secrete or enhance levels of healing factors (e.g., vascular endothelial growth factor (VEGF), insulin-like growth factor (IGF), platelet-derived growth factor (PDGF), transforming growth factor- ⁇ (TGF- ⁇ ), and epidermal growth factor (EGF)).
  • a second wound therapy e.g., antibiotic or antibacterial use, debridement, irrigation, negative pressure wound therapy (vacuum-assisted closure), warming, oxygenation, moist wound healing, removing mechanical stress, and/or adding cells (e.g., ker
  • the second wound therapy comprises a negative pressure wound therapy (vacuum-assisted closure).
  • the second wound therapy comprises an antibiotic.
  • the composition overcomes (e.g., reduces, decreases, prevents) a deleterious effect of the antibiotic in wound healing.
  • the second wound therapy comprises a steroidal or non-steroidal anti-inflammatory drug (NSIAD).
  • the composition acts additively or synergysically with the steroidal or non-steroidal anti-inflammatory drug.
  • the composition is administered topically or orally, e.g., by topical rinse, gel, spray, oral, enema, inhalation, dry powder, aerosolized powder, aerosolized liquid, eye drop.
  • the composition is combined in a multicomponent wound dressing.
  • the composition is administered orally to treat a wound (e.g., damaged mucosa) in the gastrointestinal tract and/or an inflammatory gastrointestinal disorder.
  • the composition is administered topically to treat a wound, and/or reduce or prevent a scar, e.g., in the eye.
  • the effective amount is therapeutically effective amount.
  • the soluble or derivatized chitosan is soluble in aqueous solution from about pH 6.8 to about pH 7.4.
  • the soluble or derivatized chitosan is soluble in aqueous solution from about pH 3 to about pH 9.
  • the soluble or derivatized chitosan is soluble in aqueous solution from about pH 5.0 to about pH 6.0, e.g., in wounds or duodenum.
  • the soluble or derivatized chitosan is soluble in aqueous solution from about pH 2.0 to about pH 4.0, e.g., in stomach.
  • the soluble or derivatized chitosan is soluble in aqueous solution from about pH 8.0 to about pH 8.5, e.g., in lower part of the gastrointestinal tract.
  • the soluble chitosan is underivatized.
  • the derivatized chitosan comprises a chitosan of the following formula (I):
  • n is an integer between 20 and 6000;
  • each R 1 is independently selected for each occurrence from hydrogen, acetyl, and either:
  • R 2 is hydrogen or amino
  • R 3 is amino, guanidino, C 1 -C 6 alkyl substituted with an amino or guanidino moiety, or a natural or unnatural amino acid side chain; or
  • R 1 substituents are H, at least 1% of R 1 substituents are acetyl, and at least 2% of R 1 substituents are a group of formula (II) or are taken together with the nitrogen to which they are attached to form a guanidine moiety.
  • the derivatized chitosan comprises of the following formula (I) wherein at least 90% by number or weight of R 1 moieties are as defined in formula (I) (e.g., at least about 95%, at least about 96%, at least about 97%, at least about 98%, or at least about 99%):
  • n is an integer between 20 and 6000;
  • each R 1 is independently selected for each occurrence from hydrogen, acetyl, and either:
  • R 2 is hydrogen or amino
  • R 3 is amino, guanidino, C 1 -C 6 alkyl substituted with an amino or guanidino moiety, or a natural or unnatural amino acid side chain; or
  • R 1 substituents are H, at least 1% of R 1 substituents are acetyl, and at least 2% of R 1 substituents are a group of formula (II) or are taken together with the nitrogen to which they are attached to form a guanidine moiety.
  • R 1 substituents are hydrogen.
  • R 1 substituents are hydrogen.
  • R 1 substituents are acetyl.
  • R 1 substituents are acetyl.
  • R 1 substituents are a group of formula (II).
  • R 1 substituents are a group of formula (II).
  • R 1 substituents are hydrogen, 4-20% of R 1 substituents are acetyl, 4-30% of R 1 substituents are a group of formula (II).
  • R 2 is amino and R 3 is an arginine side chain.
  • R 1 is selected from one of the following:
  • R 2 is amino and R 3 is a lysine side chain.
  • R 1 is selected from one of the following:
  • R 2 is amino and R 3 is a histidine side chain.
  • R 1 is selected from one of the following:
  • At least 1% of R 1 substituents are selected from one of the following:
  • R 1 substituents are selected from the following:
  • R 2 is amino and R 3 is a substituted C 1 -C 6 alkyl.
  • R 3 is C 1 -C 6 alkyl substituted with an amino group.
  • R 3 is C 1 alkyl substituted with an amino group.
  • R 3 is C 2 alkyl substituted with an amino group.
  • R 3 is C 3 alkyl substituted with an amino group.
  • R 3 is C 4 alkyl substituted with an amino group.
  • R 3 is C 5 alkyl substituted with an amino group.
  • R 3 is C 6 alkyl substituted with an amino group.
  • R 1 is selected from one of the following:
  • R 3 is C 1 -C 6 alkyl substituted with a guanidino group.
  • R 3 is C 1 alkyl substituted with a guanidino group.
  • R 3 is C 2 alkyl substituted with a guanidino group.
  • R 3 is C 3 alkyl substituted with a guanidino group.
  • R 3 is C 4 alkyl substituted with a guanidino group.
  • R 3 is C 5 alkyl substituted with a guanidino group.
  • R 3 is C 6 alkyl substituted with a guanidino group.
  • R 1 is selected from one of the following:
  • R 2 is amino that is substituted with a nitrogen protecting group prior to substitution on chitosan and removed subsequent to substitution on chitosan.
  • the nitrogen protecting group is tert-butyloxycarbonyl (Boc).
  • a nitrogen protecting group is used, which can provide an intermediate polymer having a nitrogen protecting group such as Boc.
  • R 2 is amino
  • R 2 is hydrogen and R 3 is amino.
  • R 2 is hydrogen and R 3 is guanidino.
  • R 2 is hydrogen and R 3 is a substituted C 1 -C 6 alkyl.
  • R 3 is C 1 -C 6 alkyl substituted with an amino group.
  • R 3 is C 1 alkyl substituted with an amino group.
  • R 3 is C 2 alkyl substituted with an amino group.
  • R 3 is C 3 alkyl substituted with an amino group.
  • R 3 is C 4 alkyl substituted with an amino group.
  • R 3 is C 5 alkyl substituted with an amino group.
  • R 3 is C 6 alkyl substituted with an amino group.
  • R 1 is selected from one of the following:
  • R 3 is C 1 -C 6 alkyl substituted with a guanidino group.
  • R 3 is C 1 alkyl substituted with a guanidino group.
  • R 3 is C 2 alkyl substituted with a guanidino group.
  • R 3 is C 3 alkyl substituted with a guanidino group.
  • R 3 is C 4 alkyl substituted with a guanidino group.
  • R 3 is C 5 alkyl substituted with a guanidino group.
  • R 3 is C 6 alkyl substituted with a guanidino group.
  • R 1 is selected from one of the following:
  • R 1 substituents are H, at least 1% of R 1 substituents are acetyl, and at least 2% of R 1 substituents independently selected from any of the formulae specifically shown above.
  • the functionalized chitosan of formula (I) may be further derivatized on the free hydroxyl moieties.
  • the molecular weight of the functionalized chitosan is between 5,000 and 1,000,000 Da.
  • the molecular weight of the functionalized chitosan is between 10,000 and 350,000 Da.
  • the molecular weight of the functionalized chitosan is between 10,000 and 60,000 Da.
  • the molecular weight of the functionalized chitosan is between 15,000 and 45,000 Da.
  • the molecular weight of the functionalized chitosan is between 15,000 and 35,000 Da.
  • the molecular weight of the functionalized chitosan is between 15,000 and 25,000 Da.
  • the functionalized chitosan is soluble in aqueous solution between pH 6 and 8.
  • the functionalized chitosan is soluble in aqueous solution between pH 6.8 and pH 7.4.
  • the chitosan is functionalized at between 5% and 50%.
  • the chitosan is functionalized at between 20% and 30%.
  • the degree of deacetylation (% DDA) of the derivatized chitosan is between 75% and 95%.
  • the degree of deacetylation (% DDA) of the derivatized chitosan is between 80% and 90%.
  • the polydispersity index (PDI) of the derivatized chitosan is between 1.0 and 2.5.
  • the polydispersity index (PDI) of the derivatized chitosan is between 1.2 and 1.8.
  • the functionalized chitosan is substantially free of other impurities.
  • the invention features a method of treating a wound in a subject, the method comprising administering to a subject an effective amount of a composition comprising a soluble or derivatized chitosan and a second agent, thereby treating the wound.
  • the composition reduces the healing time or increases the healing rate of the wound. In some embodiments, the composition decreases the inflammation associated with wound or healing of the wound.
  • the soluble or derivatized chitosan and the second agent are present at a concentration, or administered at a dose, which results in a synergistic effect, e.g., the wound healing rate is greater, e.g., at least 2, 5, 10, 20, 50 or 100 times greater, than the sum of the wound healing rates seen with either used alone.
  • the second agent is present at a concentration, or administered at a dose, which is less than the lowest concentration or dose, that would achieve the minimum healing time or maximum healing rate of the wound in the absence of the soluble or derivatized chitosan.
  • the second agent is present at a concentration, or administered at a dose, which is less than the lowest concentration or dose, generally used to treat the wound.
  • the second agent is present at a concentration, or administered at a dose, which is less than 90, 80, 70, 60, 50, 40, 30, 20, 10, 5, 1, 0.1, 0.01% of the lowest concentration, or dose, that would give maximum wound healing rate in the absence of the soluble or derivatized chitosan.
  • the second agent is present at a concentration, or administered at a dose, which is less than 90, 80, 70, 60, 50, 40, 30, 20, 10, 5, 1, 0.1, 0.01% of the lowest concentration, or dose, generally used to treat the wound.
  • the second agent is a peptide growth factor. In another embodiment, the second agent is epidermal growth factor (EGF).
  • EGF epidermal growth factor
  • the second agent comprises an antibiotic.
  • the composition overcomes (e.g., reduces, decreases, prevents) a deleterious effect of the antibiotic in wound healing.
  • the soluble or derivatized chitosan increases a measurable effect of the second agent the by at least 2, 5, 10, 20, 50 or 100 fold, compared to the effect in the absence of the soluble or derivatized chitosan.
  • the subject is a human, an animal (e.g., a farm, circus, or zoo animal, or a companion pet).
  • an animal e.g., a farm, circus, or zoo animal, or a companion pet.
  • the subject has a chronic disease.
  • the chronic disease is selected from the group consisting of inflammatory bowel disease (IBD) (e.g., Crohn's disease), diabetes (e.g., diabetes mellitus types 1 or type 2), chronic kidney disease (CKD), chronic obstructive pulmonary disease (COPD), hypothyroidism, multiple sclerosis, rheumatoid arthritis, hepatic encephalopathy, peritonitis, periodontitis, sinusitis, rhinitis, sepsis, hepatic encephalopathy, and systemic lupus erythematosus.
  • IBD inflammatory bowel disease
  • diabetes e.g., diabetes mellitus types 1 or type 2
  • COPD chronic obstructive pulmonary disease
  • hypothyroidism e.g., multiple sclerosis, rheumatoid arthritis, hepatic encephalopathy, peritonitis, periodontitis, sinusitis,
  • the subject has been treated or is being treated with one or more of the cancer therapies, e.g., chemotherapy or radiation therapy.
  • the composition is administered to the subject before, during, or after the subject is treated with the cancer therapy.
  • the composition is administered to the subject prior to the therapy, e.g., for at least about 1 day, 2 days, 3 days, 5 days, or 1 week.
  • the composition is administered to the subject less than about 1 day, 2 days, 4 days, 1 week, 2 weeks, 3 weeks, or 4 weeks after the subject is treated with the cancer therapy.
  • the subject has been treated or is being treated with immunosuppressive therapy.
  • the composition is administered to the subject prior to the therapy, e.g., for at least about 1 day, 2 days, 3 days, 5 days, or 1 week. In an embodiment, the composition is administered to the subject less than about 1 day, 2 days, 4 days, 1 week, 2 weeks, 3 weeks, or 4 weeks after the subject is treated with the immunosuppressive therapy.
  • the wound is caused by e.g., chemotherapy, radiation therapy, immunosuppressive therapy, chemical damage, biological damage, radiological damage, or immunodeficiency or compromise of immune system (e.g., primary immunodeficiency or acquired immunodeficiency (e.g., AIDS, malnutrition, aging, particular medications (e.g. chemotherapy, disease-modifying antirheumatic drugs, immunosuppressive drugs after organ transplants, glucocorticoids)).
  • chemotherapy radiation therapy
  • immunosuppressive therapy chemical damage, biological damage, radiological damage
  • immunodeficiency or compromise of immune system e.g., primary immunodeficiency or acquired immunodeficiency (e.g., AIDS, malnutrition, aging, particular medications (e.g. chemotherapy, disease-modifying antirheumatic drugs, immunosuppressive drugs after organ transplants, glucocorticoids)).
  • the second agent is administered orally or topically.
  • the wound is the result of an infection, e.g., bacterial or viral infection, and wherein the infection is no longer present when the wound is treated.
  • the wound is the result of an infection, e.g., bacterial or viral infection, and wherein the infection is present when the wound is treated.
  • the wound is an acute wound.
  • the wound is a chronic wound, e.g., a wound that does not heal in an orderly set of stages, in a predictable amount of time, or within three months.
  • the wound is a surgical wound, e.g., a wound resulted from medical grafting (e.g., skin or bone grafting) at the donor site and/or the graft site, full thickness or partial thickness excision.
  • the wound is a burn wound.
  • the wound is in the epidermis, dermis or hypodermis. In an embodiment, the wound is in the mucosal membrane.
  • the wound is a venous ulcer, a diabetic ulcer, a corneal ulcer (or damage to the corneal epithelium), an oral ulcer, a peptic ulcer, or a pressure ulcer.
  • the composition is administered to the subject less than about 5 minutes, 15 minutes, 30 minutes, 1 hour, 2 hours, 4 hours, 6 hours, 12 hours, 24 hours, 2 days, 3 days, 4 days, 5 days, 6 days, 7 days, 2 weeks, 4 weeks, 2 months, 4 months, 6 months, 8 months, 10 months, or 1 year after the subject is wounded.
  • the healing time of the wound (e.g., the length of one or more of the inflammatory, proliferative, or remodeling phase of wound healing) is reduced by at least about 10%, 20%, 30%, 40%, 50%, 60%, 70%, 80%, 90%, or 95%, compared to the healing time of the wound (e.g., the length of one or more of the inflammatory, proliferative, or remodeling phase of wound healing) that has not been contacted with the soluble or derivatized chitosan.
  • the wound healing rate (e.g., the absolute area healed per day, the percentage of initial area healed per day, or the greatest average wound margin distance from the wound centre divided by the time to complete wound closure) is increased by at least about 1, 2, 3, 4, 5, 6, 7, 8, 9, or 10 fold, compared to the healing rate of the wound that has not been contacted with the soluble or derivatized chitosan.
  • the method further comprises administering to the subject a second wound therapy, e.g., antibiotic or antibacterial use, debridement, irrigation, negative pressure wound therapy (vacuum-assisted closure), warming, oxygenation, moist wound healing, removing mechanical stress, and/or adding cells (e.g., keratinocytes) or other materials (e.g., artificial skin substitutes that have fibroblasts and/or keratinocytes in a matrix of collagen) to secrete or enhance levels of healing factors (e.g., vascular endothelial growth factor (VEGF), insulin-like growth factor (IGF), platelet-derived growth factor (PDGF), transforming growth factor- ⁇ (TGF- ⁇ ), and epidermal growth factor (EGF)).
  • a second wound therapy e.g., antibiotic or antibacterial use, debridement, irrigation, negative pressure wound therapy (vacuum-assisted closure), warming, oxygenation, moist wound healing, removing mechanical stress, and/or adding cells (e.g., ker
  • the second wound therapy comprises a negative pressure wound therapy (vacuum-assisted closure).
  • the second wound therapy comprises an antibiotic.
  • the composition overcomes (e.g., reduces, decreases, prevents) a deleterious effect of the antibiotic in wound healing.
  • the second wound therapy comprises a steroidal or non-steroidal anti-inflammatory drug (NSIAD).
  • the composition acts additively or synergysically with the steroidal or non-steroidal anti-inflammatory drug.
  • the composition is administered topically or orally, e.g., by topical rinse, gel, spray, oral, enema, inhalation, dry powder, aerosolized liquid, eye drop.
  • the composition is administered orally to treat a wound (e.g., damaged mucosa) in the gastrointestinal tract and/or an inflammatory gastrointestinal disorder.
  • the composition is administered topically to treat a wound, and/or reduce or prevent a scar, e.g., in the eye.
  • the composition is administered before, during or after one or more of the wound healing phase, e.g., inflammatory, proliferative, or remodeling phase.
  • the wound healing phase e.g., inflammatory, proliferative, or remodeling phase.
  • the effective amount is therapeutically effective amount.
  • the soluble or derivatized chitosan is soluble in aqueous solution from about pH 6.8 to about pH 7.4.
  • the soluble or derivatized chitosan is soluble in aqueous solution from about pH 3 to about pH 9.
  • the soluble or derivatized chitosan is soluble in aqueous solution from about pH 5.0 to about pH 6.0, e.g., in wounds or duodenum.
  • the soluble or derivatized chitosan is soluble in aqueous solution from about pH 2.0 to about pH 4.0, e.g., in stomach.
  • the soluble or derivatized chitosan is soluble in aqueous solution from about pH 8.0 to about pH 8.5, e.g., in lower part of the gastrointestinal tract.
  • the derivatized chitosan comprises a chitosan of the following formula (I):
  • n is an integer between 20 and 6000;
  • each R 1 is independently selected for each occurrence from hydrogen, acetyl, and either:
  • R 2 is hydrogen or amino
  • R 3 is amino, guanidino, C 1 -C 6 alkyl substituted with an amino or guanidino moiety, or a natural or unnatural amino acid side chain; or
  • R 1 substituents are H, at least 1% of R 1 substituents are acetyl, and at least 2% of R 1 substituents are a group of formula (II) or are taken together with the nitrogen to which they are attached to form a guanidine moiety.
  • the derivatized chitosan comprises of the following formula (I) wherein at least 90% by number or weight of R 1 moieties are as defined in formula (I) (e.g., at least about 95%, at least about 96%, at least about 97%, at least about 98%, or at least about 99%):
  • n is an integer between 20 and 6000;
  • each R 1 is independently selected for each occurrence from hydrogen, acetyl, and either:
  • R 2 is hydrogen or amino
  • R 3 is amino, guanidino, C 1 -C 6 alkyl substituted with an amino or guanidino moiety, or a natural or unnatural amino acid side chain; or
  • R 1 substituents are H, at least 1% of R 1 substituents are acetyl, and at least 2% of R 1 substituents are a group of formula (II) or are taken together with the nitrogen to which they are attached to form a guanidine moiety.
  • R 1 substituents are hydrogen.
  • R 1 substituents are hydrogen.
  • R 1 substituents are acetyl.
  • R 1 substituents are acetyl.
  • R 1 substituents are a group of formula (II).
  • R 1 substituents are a group of formula (II).
  • R 1 substituents are hydrogen, 4-20% of R 1 substituents are acetyl, 4-30% of R 1 substituents are a group of formula (II).
  • R 2 is amino and R 3 is an arginine side chain.
  • R 1 is selected from one of the following:
  • R 2 is amino and R 3 is a lysine side chain.
  • R 1 is selected from one of the following:
  • R 2 is amino and R 3 is a histidine side chain.
  • R 1 is selected from one of the following:
  • At least 1% of R 1 substituents are selected from one of the following:
  • R 1 substituents are selected from the following:
  • R 2 is amino and R 3 is a substituted C 1 -C 6 alkyl.
  • R 3 is C 1 -C 6 alkyl substituted with an amino group.
  • R 3 is C 1 alkyl substituted with an amino group.
  • R 3 is C 2 alkyl substituted with an amino group.
  • R 3 is C 3 alkyl substituted with an amino group.
  • R 3 is C 4 alkyl substituted with an amino group.
  • R 3 is C 5 alkyl substituted with an amino group.
  • R 3 is C 6 alkyl substituted with an amino group.
  • R 1 is selected from one of the following:
  • R 3 is C 1 -C 6 alkyl substituted with a guanidino group.
  • R 3 is C 1 alkyl substituted with a guanidino group.
  • R 3 is C 2 alkyl substituted with a guanidino group.
  • R 3 is C 3 alkyl substituted with a guanidino group.
  • R 3 is C 4 alkyl substituted with a guanidino group.
  • R 3 is C 5 alkyl substituted with a guanidino group.
  • R 3 is C 6 alkyl substituted with a guanidino group.
  • R 1 is selected from one of the following:
  • R 2 is amino that is substituted with a nitrogen protecting group prior to substitution on chitosan and removed subsequent to substitution on chitosan.
  • the nitrogen protecting group is tert-butyloxycarbonyl (Boc).
  • a nitrogen protecting group is used, which can provide an intermediate polymer having a nitrogen protecting group such as Boc.
  • R 2 is amino
  • R 2 is hydrogen and R 3 is amino.
  • R 2 is hydrogen and R 3 is guanidino.
  • R 2 is hydrogen and R 3 is a substituted C 1 -C 6 alkyl.
  • R 3 is C 1 -C 6 alkyl substituted with an amino group.
  • R 3 is C 1 alkyl substituted with an amino group.
  • R 3 is C 2 alkyl substituted with an amino group.
  • R 3 is C 3 alkyl substituted with an amino group.
  • R 3 is C 4 alkyl substituted with an amino group.
  • R 3 is C 5 alkyl substituted with an amino group.
  • R 3 is C 6 alkyl substituted with an amino group.
  • R 1 is selected from one of the following:
  • R 3 is C 1 -C 6 alkyl substituted with a guanidino group.
  • R 3 is C 1 alkyl substituted with a guanidino group.
  • R 3 is C 2 alkyl substituted with a guanidino group.
  • R 3 is C 3 alkyl substituted with a guanidino group.
  • R 3 is C 4 alkyl substituted with a guanidino group.
  • R 3 is C 5 alkyl substituted with a guanidino group.
  • R 3 is C 6 alkyl substituted with a guanidino group.
  • R 1 is selected from one of the following:
  • R 1 substituents are H, at least 1% of R 1 substituents are acetyl, and at least 2% of R 1 substituents independently selected from any of the formulae specifically shown above.
  • the functionalized chitosan of formula (I) may be further derivatized on the free hydroxyl moieties.
  • the molecular weight of the functionalized chitosan is between 5,000 and 1,000,000 Da.
  • the molecular weight of the functionalized chitosan is between 10,000 and 350,000 Da.
  • the molecular weight of the functionalized chitosan is between 10,000 and 60,000 Da.
  • the molecular weight of the functionalized chitosan is between 15,000 and 45,000 Da.
  • the molecular weight of the functionalized chitosan is between 15,000 and 35,000 Da.
  • the molecular weight of the functionalized chitosan is between 15,000 and 25,000 Da.
  • the functionalized chitosan is soluble in aqueous solution between pH 6 and 8.
  • the functionalized chitosan is soluble in aqueous solution between pH 6.8 and pH 7.4.
  • the chitosan is functionalized at between 5% and 50%.
  • the chitosan is functionalized at between 20% and 30%.
  • the degree of deacetylation (% DDA) of the derivatized chitosan is between 75% and 95%.
  • the degree of deacetylation (% DDA) of the derivatized chitosan is between 80% and 90%.
  • the polydispersity index (PDI) of the derivatized chitosan is between 1.0 and 2.5.
  • the polydispersity index (PDI) of the derivatized chitosan is between 1.2 and 1.8.
  • the functionalized chitosan is substantially free of other impurities.
  • the invention features a method of treating a subject who has been treated or is being treated for cancer with one or more cancer therapies, the method comprising administering to the subject an effective amount of a composition comprising a soluble or derivatized chitosan, thereby treating the subject.
  • the subject has mucositis or a symptom of mucositis.
  • the composition reduces one or more symptoms of mucositis.
  • the cancer therapy comprises chemotherapy (e.g., 5-fluorouracil (5-FU), irinotecan, or melphalan hydrochloride) or radiation therapy.
  • chemotherapy e.g., 5-fluorouracil (5-FU), irinotecan, or melphalan hydrochloride
  • radiation therapy e.g., 5-fluorouracil (5-FU), irinotecan, or melphalan hydrochloride
  • the mucositis occurs, e.g., in the gastrointestinal (GI) tract, e.g., mouth, throat, esophagus.
  • the symptom of mucositis comprises thinning of the mucosal lining, inflammation, ulceration, peripheral, erythema, pain, and/or dysgeusia.
  • mucositis is the result of an infection, e.g., bacterial or viral infection, and wherein the infection is no longer present when the mucositis is treated.
  • mucositis is the result of an infection, e.g., bacterial or viral infection, and wherein the infection is present when the mucositis is treated.
  • the composition reduces the severity of mucositis (e.g., oral mucositis) by at least 1, 2, 3 or 4 grades, e.g., based on the World Health Organization (WHO) Oral Toxicity score, the National Cancer Institute Common Toxicity Criteria (NCI-CTC) for Oral Mucositis, or the Oral Mucositis Assessment Scale (OMAS).
  • WHO World Health Organization
  • NCI-CTC National Cancer Institute Common Toxicity Criteria
  • OFS Oral Mucositis Assessment Scale
  • the composition reduces the healing time or increase the healing rate of mucositis. In some embodiments, the composition decreases the inflammation associated with mucositis or healing of the mucositis.
  • the healing time of mucositis (e.g., the length of one or more of the initiation, message generation, signaling and amplification, ulceration, or healing phase of mucositis) is reduced by at least about 10%, 20%, 30%, 40%, 50%, 60%, 70%, 80%, 90%, or 95%, compared to the healing time of mucositis that has not been contacted with the soluble or derivatized chitosan.
  • the composition is administered to the subject before, during, or after the subject is treated with the cancer therapy.
  • the composition is administered to the subject prior to the therapy, e.g., for at least about 1 day, 2 days, 3 days, 5 days, or 1 week.
  • the composition is administered to the subject less than about 1 day, 2 days, 3 days, 4 days, 5 days, 6 days, 1 week, 2 weeks, 3 weeks, or 4 weeks after the subject is treated with the cancer therapy.
  • the composition is administered to the subject before, during, or after the subject is treated with the immunosuppressive therapy.
  • the composition is administered to the subject prior to the therapy, e.g., for at least about 1 day, 2 days, 3 days, 5 days, or 1 week.
  • the composition is administered to the subject less than about 1 day, 2 days, 3 days, 4 days, 5 days, 6 days, 1 week, 2 weeks, 3 weeks, or 4 weeks after the subject is treated with the immunosuppressive therapy.
  • the method further comprises administering to the subject a second therapy (e.g., a second mucositis therapy), e.g., antibiotics, oral hygiene, water-soluble jellies, salt mouthwash, keratinocyte growth factor (KGF), cytokines or modifier of inflammation (e.g., IL-1, IL-10, IL-11, TGF- ⁇ ), amino acid supplementation (e.g., glutamine), vitamin, colony-stimulating factor (CSF), cryotherapy, laser therapy, barrier protection agent (e.g., concentrated oral gel product (e.g., GELCLAIR®), or medicinal mouthwash (e.g., CAPHOSOL®, MUGARD®).
  • a second therapy e.g., a second mucositis therapy
  • a second therapy e.g., antibiotics, oral hygiene, water-soluble jellies, salt mouthwash, keratinocyte growth factor (KGF), cytokines or modifier of inflammation (e.g., IL-1, IL
  • the second therapy comprises an antibiotic.
  • the composition overcomes (e.g., reduces, decreases, prevents) a deleterious effect of the antibiotic in wound healing.
  • the second therapy comprises a steroidal or non-steroidal anti-inflammatory drug (NSIAD).
  • the composition acts additively or synergysically with the steroidal or non-steroidal anti-inflammatory drug.
  • the composition is administered topically or orally, e.g., by topical rinse, gel, spray, oral, enema, inhalation, dry powder, aerosolized liquid, aerosolized powder, eye drop.
  • the composition is administered orally to treat a wound (e.g., damaged mucosa) in the gastrointestinal tract and/or an inflammatory gastrointestinal disorder.
  • the composition is administered topically to treat a wound, and/or reduce or prevent a scar, e.g., in the eye.
  • the composition is administered before, during or after one or more of the healing phase of mucositis, e.g., initiation, message generation, signaling and amplification, ulceration, or healing phase.
  • the healing phase of mucositis e.g., initiation, message generation, signaling and amplification, ulceration, or healing phase.
  • the effective amount is therapeutically effective amount.
  • the soluble or derivatized chitosan is soluble in aqueous solution from about pH 6.8 to about pH 7.4.
  • the soluble or derivatized chitosan is soluble in aqueous solution from about pH 3 to about pH 9.
  • the soluble or derivatized chitosan is soluble in aqueous solution from about pH 5.0 to about pH 6.0, e.g., in wounds or duodenum.
  • the soluble or derivatized chitosan is soluble in aqueous solution from about pH 2.0 to about pH 4.0, e.g., in stomach.
  • the soluble or derivatized chitosan is soluble in aqueous solution from about pH 8.0 to about pH 8.5, e.g., in lower part of the gastrointestinal tract.
  • the derivatized chitosan comprises a chitosan of the following formula (I):
  • n is an integer between 20 and 6000;
  • each R 1 is independently selected for each occurrence from hydrogen, acetyl, and either:
  • R 2 is hydrogen or amino
  • R 3 is amino, guanidino, C 1 -C 6 alkyl substituted with an amino or guanidino moiety, or a natural or unnatural amino acid side chain; or
  • R 1 substituents are H, at least 1% of R 1 substituents are acetyl, and at least 2% of R 1 substituents are a group of formula (II) or are taken together with the nitrogen to which they are attached to form a guanidine moiety.
  • the derivatized chitosan comprises of the following formula (I) wherein at least 90% by number or weight of R 1 moieties are as defined in formula (I) (e.g., at least about 95%, at least about 96%, at least about 97%, at least about 98%, or at least about 99%):
  • n is an integer between 20 and 6000;
  • each R 1 is independently selected for each occurrence from hydrogen, acetyl, and either:
  • R 2 is hydrogen or amino
  • R 3 is amino, guanidino, C 1 -C 6 alkyl substituted with an amino or guanidino moiety, or a natural or unnatural amino acid side chain; or
  • R 1 substituents are H, at least 1% of R 1 substituents are acetyl, and at least 2% of R 1 substituents are a group of formula (II) or are taken together with the nitrogen to which they are attached to form a guanidine moiety.
  • R 1 substituents are hydrogen.
  • R 1 substituents are hydrogen.
  • R 1 substituents are acetyl.
  • R 1 substituents are acetyl.
  • R 1 substituents are a group of formula (II).
  • R 1 substituents are a group of formula (II).
  • R 1 substituents are hydrogen, 4-20% of R 1 substituents are acetyl, 4-30% of R 1 substituents are a group of formula (II).
  • R 2 is amino and R 3 is an arginine side chain.
  • R 1 is selected from one of the following:
  • R 2 is amino and R 3 is a lysine side chain.
  • R 1 is selected from one of the following:
  • R 2 is amino and R 3 is a histidine side chain.
  • R 1 is selected from one of the following:
  • At least 1% of R 1 substituents are selected from one of the following:
  • R 1 substituents are selected from the following:
  • R 2 is amino and R 3 is a substituted C 1 -C 6 alkyl.
  • R 3 is C 1 -C 6 alkyl substituted with an amino group.
  • R 3 is C 1 alkyl substituted with an amino group.
  • R 3 is C 2 alkyl substituted with an amino group.
  • R 3 is C 3 alkyl substituted with an amino group.
  • R 3 is C 4 alkyl substituted with an amino group.
  • R 3 is C 5 alkyl substituted with an amino group.
  • R 3 is C 6 alkyl substituted with an amino group.
  • R 1 is selected from one of the following:
  • R 3 is C 1 -C 6 alkyl substituted with a guanidino group.
  • R 3 is C 1 alkyl substituted with a guanidino group.
  • R 3 is C 2 alkyl substituted with a guanidino group.
  • R 3 is C 3 alkyl substituted with a guanidino group.
  • R 3 is C 4 alkyl substituted with a guanidino group.
  • R 3 is C 5 alkyl substituted with a guanidino group.
  • R 3 is C 6 alkyl substituted with a guanidino group.
  • R 1 is selected from one of the following:
  • R 2 is amino that is substituted with a nitrogen protecting group prior to substitution on chitosan and removed subsequent to substitution on chitosan.
  • the nitrogen protecting group is tert-butyloxycarbonyl (Boc).
  • a nitrogen protecting group is used, which can provide an intermediate polymer having a nitrogen protecting group such as Boc.
  • R 2 is amino
  • R 2 is hydrogen and R 3 is amino.
  • R 2 is hydrogen and R 3 is guanidino.
  • R 2 is hydrogen and R 3 is a substituted C 1 -C 6 alkyl.
  • R 3 is C 1 -C 6 alkyl substituted with an amino group.
  • R 3 is C 1 alkyl substituted with an amino group.
  • R 3 is C 2 alkyl substituted with an amino group.
  • R 3 is C 3 alkyl substituted with an amino group.
  • R 3 is C 4 alkyl substituted with an amino group.
  • R 3 is C 5 alkyl substituted with an amino group.
  • R 3 is C 6 alkyl substituted with an amino group.
  • R 1 is selected from one of the following:
  • R 3 is C 1 -C 6 alkyl substituted with a guanidino group.
  • R 3 is C 1 alkyl substituted with a guanidino group.
  • R 3 is C 2 alkyl substituted with a guanidino group.
  • R 3 is C 3 alkyl substituted with a guanidino group.
  • R 3 is C 4 alkyl substituted with a guanidino group.
  • R 3 is C 5 alkyl substituted with a guanidino group.
  • R 3 is C 6 alkyl substituted with a guanidino group.
  • R 1 is selected from one of the following:
  • R 1 substituents are H, at least 1% of R′ substituents are acetyl, and at least 2% of R 1 substituents independently selected from any of the formulae specifically shown above.
  • the functionalized chitosan of formula (I) may be further derivatized on the free hydroxyl moieties.
  • the molecular weight of the functionalized chitosan is between 5,000 and 1,000,000 Da.
  • the molecular weight of the functionalized chitosan is between 10,000 and 350,000 Da.
  • the molecular weight of the functionalized chitosan is between 10,000 and 60,000 Da.
  • the molecular weight of the functionalized chitosan is between 15,000 and 45,000 Da.
  • the molecular weight of the functionalized chitosan is between 15,000 and 35,000 Da.
  • the molecular weight of the functionalized chitosan is between 15,000 and 25,000 Da.
  • the functionalized chitosan is soluble in aqueous solution between pH 6 and 8.
  • the functionalized chitosan is soluble in aqueous solution between pH 6.8 and pH 7.4.
  • the chitosan is functionalized at between 5% and 50%.
  • the chitosan is functionalized at between 20% and 30%.
  • the degree of deacetylation (% DDA) of the derivatized chitosan is between 75% and 95%.
  • the degree of deacetylation (% DDA) of the derivatized chitosan is between 80% and 90%.
  • the polydispersity index (PDI) of the derivatized chitosan is between 1.0 and 2.5.
  • the polydispersity index (PDI) of the derivatized chitosan is between 1.2 and 1.8.
  • the functionalized chitosan is substantially free of other impurities.
  • the invention features a method of treating a subject having a chronic disease or a symptom of a chronic disease, the method comprising: administering to a subject an effective amount of a composition comprising a soluble or derivatized chitosan, thereby treating the subject.
  • the symptom of the chronic disease comprises poor or slow poor healing.
  • the chronic disease is associated with poor or slow wound healing.
  • the chronic disease is associated with inflammation.
  • the chronic disease is selected from the group consisting of inflammatory bowel disease (IBD) (e.g., Crohn's disease), diabetes (e.g., diabetes mellitus types 1 or type 2), chronic kidney disease (CKD), chronic obstructive pulmonary disease (COPD), hypothyroidism, multiple sclerosis, rheumatoid arthritis, hepatic encephalopathy, peritonitis, periodontitis, sinusitis, rhinitis, sepsis, and systemic lupus erythematosus.
  • IBD inflammatory bowel disease
  • diabetes e.g., diabetes mellitus types 1 or type 2
  • COPD chronic obstructive pulmonary disease
  • hypothyroidism e.g., multiple sclerosis, rheumatoid arthritis, hepatic encephalopathy, peritonitis, periodontitis, sinusitis, rhinitis, sepsis, and systemic lupus ery
  • the subject has a wound.
  • the wound is an acute wound.
  • the wound is a chronic wound, e.g., a wound that does not heal in an orderly set of stages, in a predictable amount of time, or within three months.
  • the wound is a surgical wound, e.g., a wound resulted from medical grafting (e.g., skin or bone grafting) at the donor site and/or the graft site, full thickness or partial thickness excision.
  • the wound is a burn wound.
  • the wound is in the epidermis, dermis or hypodermis. In another embodiment, the wound is in the mucosal membrane.
  • the wound is a venous ulcer, a diabetic ulcer, a corneal ulcer (or damage to the corneal epithelium), oral ulcer, peptic ulcer, or a pressure ulcer.
  • the wound is the result of an infection, e.g., bacterial or viral infection, and wherein the infection is no longer present when the wound is treated.
  • the wound is the result of an infection, e.g., bacterial or viral infection, and wherein the infection is still present when the wound is treated.
  • the composition is administered to the subject less than about 5 minutes, 15 minutes, 30 minutes, 1 hour, 2 hours, 4 hours, 6 hours, 12 hours, 24 hours, 2 days, 3 days, 4 days, 5 days, 6 days, 7 days, 2 weeks, 4 weeks, 2 months, 4 months, 6 months, 8 months, 10 months, or 1 year after the subject is wounded.
  • the composition reduces the healing time or increase the healing rate of the wound. In some embodiments, the composition decreases the inflammation associated with wound or healing of the wound.
  • the healing time of the wound (e.g., the length of one or more of the inflammatory, proliferative, or remodeling phase of wound healing) is reduced by at least about 10%, 20%, 30%, 40%, 50%, 60%, 70%, 80%, 90%, or 95%, compared to the healing time of the wound (e.g., the length of one or more of the inflammatory, proliferative, or remodeling phase of wound healing) that has not been contacted with the soluble or derivatized chitosan.
  • the wound healing rate (e.g., the absolute area healed per day, the percentage of initial area healed per day, or the greatest average wound margin distance from the wound centre divided by the time to complete wound closure) is increased by at least about 1, 2, 3, 4, 5, 6, 7, 8, 9, or 10 fold, compared to the healing rate of the wound that has not been contacted with the soluble or derivatized chitosan.
  • the method further comprises administering to the subject a second wound therapy, e.g., antibiotic or antibacterial use, debridement, irrigation, negative pressure wound therapy (vacuum-assisted closure), warming, oxygenation, moist wound healing, removing mechanical stress, and/or adding cells (e.g., keratinocytes) or other materials (e.g., artificial skin substitutes that have fibroblasts and/or keratinocytes in a matrix of collagen) to secrete or enhance levels of healing factors (e.g., vascular endothelial growth factor (VEGF), insulin-like growth factor (IGF), platelet-derived growth factor (PDGF), transforming growth factor- ⁇ (TGF- ⁇ ), and epidermal growth factor (EGF)).
  • a second wound therapy e.g., antibiotic or antibacterial use, debridement, irrigation, negative pressure wound therapy (vacuum-assisted closure), warming, oxygenation, moist wound healing, removing mechanical stress, and/or adding cells (e.g., ker
  • the second wound therapy comprises a negative pressure wound therapy (vacuum-assisted closure).
  • the second wound therapy comprises an antibiotic.
  • the composition overcomes (e.g., reduces, decreases, prevents) a deleterious effect of the antibiotic in wound healing.
  • the second wound therapy comprises a steroidal or non-steroidal anti-inflammatory drug (NSIAD).
  • the composition acts additively or synergysically with the steroidal or non-steroidal anti-inflammatory drug.
  • the composition is administered topically or orally, e.g., by topical rinse, gel, spray, oral, enema, inhalation, dry powder, aerosolized liquid, aerosolized powder, or eye drop.
  • the composition is administered orally to treat a wound (e.g., damaged mucosa) in the gastrointestinal tract and/or an inflammatory gastrointestinal disorder.
  • the composition is administered topically to treat a wound and/or reduce or prevent a scar, e.g., in the eye.
  • the composition is administered before, during or after one or more of the wound healing phase, e.g., inflammatory, proliferative, or remodeling phase.
  • the wound healing phase e.g., inflammatory, proliferative, or remodeling phase.
  • the effective amount is therapeutically effective amount.
  • the soluble or derivatized chitosan is soluble in aqueous solution from about pH 6.8 to about pH 7.4.
  • the soluble or derivatized chitosan is soluble in aqueous solution from about pH 3 to about pH 9.
  • the soluble or derivatized chitosan is soluble in aqueous solution from about pH 5.0 to about pH 6.0, e.g., in wounds or duodenum.
  • the soluble or derivatized chitosan is soluble in aqueous solution from about pH 2.0 to about pH 4.0, e.g., in stomach.
  • the soluble or derivatized chitosan is soluble in aqueous solution from about pH 8.0 to about pH 8.5, e.g., in lower part of the gastrointestinal tract.
  • the derivatized chitosan comprises a chitosan of the following formula (I):
  • n is an integer between 20 and 6000;
  • each R 1 is independently selected for each occurrence from hydrogen, acetyl, and either:
  • R 2 is hydrogen or amino
  • R 3 is amino, guanidino, C 1 -C 6 alkyl substituted with an amino or guanidino moiety, or a natural or unnatural amino acid side chain; or
  • R 1 substituents are H, at least 1% of R 1 substituents are acetyl, and at least 2% of R 1 substituents are a group of formula (II) or are taken together with the nitrogen to which they are attached to form a guanidine moiety.
  • the derivatized chitosan comprises of the following formula (I) wherein at least 90% by number or weight of R 1 moieties are as defined in formula (I) (e.g., at least about 95%, at least about 96%, at least about 97%, at least about 98%, or at least about 99%):
  • n is an integer between 20 and 6000;
  • each R 1 is independently selected for each occurrence from hydrogen, acetyl, and either:
  • R 2 is hydrogen or amino
  • R 3 is amino, guanidino, C 1 -C 6 alkyl substituted with an amino or guanidino moiety, or a natural or unnatural amino acid side chain; or
  • R 1 substituents are H, at least 1% of R 1 substituents are acetyl, and at least 2% of R 1 substituents are a group of formula (II) or are taken together with the nitrogen to which they are attached to form a guanidine moiety.
  • R 1 substituents are hydrogen.
  • R 1 substituents are hydrogen.
  • R 1 substituents are acetyl.
  • R 1 substituents are acetyl.
  • R 1 substituents are a group of formula (II).
  • R 1 substituents are a group of formula (II).
  • R 1 substituents are hydrogen, 4-20% of R 1 substituents are acetyl, 4-30% of R 1 substituents are a group of formula (II).
  • R 2 is amino and R 3 is an arginine side chain.
  • R 1 is selected from one of the following:
  • R 2 is amino and R 3 is a lysine side chain.
  • R 1 is selected from one of the following:
  • R 2 is amino and R 3 is a histidine side chain.
  • R 1 is selected from one of the following:
  • At least 1% of R 1 substituents are selected from one of the following:
  • R 1 substituents are selected from the following:
  • R 2 is amino and R 3 is a substituted C 1 -C 6 alkyl.
  • R 3 is C 1 -C 6 alkyl substituted with an amino group.
  • R 3 is C 1 alkyl substituted with an amino group.
  • R 3 is C 2 alkyl substituted with an amino group.
  • R 3 is C 3 alkyl substituted with an amino group.
  • R 3 is C 4 alkyl substituted with an amino group.
  • R 3 is C 5 alkyl substituted with an amino group.
  • R 3 is C 6 alkyl substituted with an amino group.
  • R 1 is selected from one of the following:
  • R 3 is C 1 -C 6 alkyl substituted with a guanidino group.
  • R 3 is C 1 alkyl substituted with a guanidino group.
  • R 3 is C 2 alkyl substituted with a guanidino group.
  • R 3 is C 3 alkyl substituted with a guanidino group.
  • R 3 is C 4 alkyl substituted with a guanidino group.
  • R 3 is C 5 alkyl substituted with a guanidino group.
  • R 3 is C 6 alkyl substituted with a guanidino group.
  • R 1 is selected from one of the following:
  • R 2 is amino that is substituted with a nitrogen protecting group prior to substitution on chitosan and removed subsequent to substitution on chitosan.
  • the nitrogen protecting group is tert-butyloxycarbonyl (Boc).
  • a nitrogen protecting group is used, which can provide an intermediate polymer having a nitrogen protecting group such as Boc.
  • R 2 is amino
  • R 2 is hydrogen and R 3 is amino.
  • R 2 is hydrogen and R 3 is guanidino.
  • R 2 is hydrogen and R 3 is a substituted C 1 -C 6 alkyl.
  • R 3 is C 1 -C 6 alkyl substituted with an amino group.
  • R 3 is C 1 alkyl substituted with an amino group.
  • R 3 is C 2 alkyl substituted with an amino group.
  • R 3 is C 3 alkyl substituted with an amino group.
  • R 3 is C 4 alkyl substituted with an amino group.
  • R 3 is C 5 alkyl substituted with an amino group.
  • R 3 is C 6 alkyl substituted with an amino group.
  • R 1 is selected from one of the following:
  • R 3 is C 1 -C 6 alkyl substituted with a guanidino group.
  • R 3 is C 1 alkyl substituted with a guanidino group.
  • R 3 is C 2 alkyl substituted with a guanidino group.
  • R 3 is C 3 alkyl substituted with a guanidino group.
  • R 3 is C 4 alkyl substituted with a guanidino group.
  • R 3 is C 5 alkyl substituted with a guanidino group.
  • R 3 is C 6 alkyl substituted with a guanidino group.
  • R 1 is selected from one of the following:
  • R 1 substituents are H, at least 1% of R 1 substituents are acetyl, and at least 2% of R 1 substituents independently selected from any of the formulae specifically shown above.
  • the functionalized chitosan of formula (I) may be further derivatized on the free hydroxyl moieties.
  • the molecular weight of the functionalized chitosan is between 5,000 and 1,000,000 Da.
  • the molecular weight of the functionalized chitosan is between 10,000 and 350,000 Da.
  • the molecular weight of the functionalized chitosan is between 10,000 and 60,000 Da.
  • the molecular weight of the functionalized chitosan is between 15,000 and 45,000 Da.
  • the molecular weight of the functionalized chitosan is between 15,000 and 35,000 Da.
  • the molecular weight of the functionalized chitosan is between 15,000 and 25,000 Da.
  • the functionalized chitosan is soluble in aqueous solution between pH 6 and 8.
  • the functionalized chitosan is soluble in aqueous solution between pH 6.8 and pH 7.4.
  • the chitosan is functionalized at between 5% and 50%.
  • the chitosan is functionalized at between 20% and 30%.
  • the degree of deacetylation (% DDA) of the derivatized chitosan is between 75% and 95%.
  • the degree of deacetylation (% DDA) of the derivatized chitosan is between 80% and 90%.
  • the polydispersity index (PDI) of the derivatized chitosan is between 1.0 and 2.5.
  • the polydispersity index (PDI) of the derivatized chitosan is between 1.2 and 1.8.
  • the functionalized chitosan is substantially free of other impurities.
  • the invention features a method of treating a subject who has suffered chemical, biological, or radiological injury, or has been affected or is being affected by one or more warfare agents (e.g., chemical warfare agent, biological warfare agent, or radiation), the method comprising administering to a subject an effective amount of a composition comprising a soluble or derivatized chitosan, thereby treating the subject.
  • one or more warfare agents e.g., chemical warfare agent, biological warfare agent, or radiation
  • the chemical warfare agent comprises a blister or vesicant agent, including, but not limited to, chlorine, chloropicrin, chlorine, chloropicrin phosgene, lewisite, or mustard gas.
  • the composition is administered to the subject less than about 5 minutes, 15 minutes, 30 minutes, 1 hour, 2 hours, 4 hours, 6 hours, 12 hours, 24 hours, 2 days, 3 days, 4 days, 5 days, 6 days, 7 days, 2 weeks, 4 weeks, 2 months, 4 months, 6 months, 8 months, 10 months, or 1 year after the subject has been affected by the warfare agent.
  • the composition is administered prophylactically, prior to injury, e.g., for at least 1 day, 2 days, 3 days, 5 days, or 1 week.
  • the subject has a wound.
  • the composition reduces the healing time or increase the healing rate of the wound. In some embodiments, the composition decreases the inflammation associated with wound or healing of the wound.
  • the healing time of the wound (e.g., the length of one or more of the inflammatory, proliferative, or remodeling phase of wound healing) is reduced by at least about 10%, 20%, 30%, 40%, 50%, 60%, 70%, 80%, 90%, or 95%, compared to the healing time of the wound (e.g., the length of one or more of the inflammatory, proliferative, or remodeling phase of wound healing) that has not been contacted with the soluble or derivatized chitosan.
  • the wound healing rate (e.g., the absolute area healed per day, the percentage of initial area healed per day, or the greatest average wound margin distance from the wound centre divided by the time to complete wound closure) is increased by at least about 1, 2, 3, 4, 5, 6, 7, 8, 9, or 10 fold, compared to the healing rate of the wound that has not been contacted with the soluble or derivatized chitosan.
  • the soluble or derivatized chitosan is soluble in aqueous solution from about pH 6.8 to about pH 7.4.
  • the soluble or derivatized chitosan is soluble in aqueous solution from about pH 3 to about pH 9.
  • the soluble or derivatized chitosan is soluble in aqueous solution from about pH 5.0 to about pH 6.0, e.g., in wounds or duodenum.
  • the soluble or derivatized chitosan is soluble in aqueous solution from about pH 2.0 to about pH 4.0, e.g., in stomach.
  • the soluble or derivatized chitosan is soluble in aqueous solution from about pH 8.0 to about pH 8.5, e.g., in lower part of the gastrointestinal tract.
  • the derivatized chitosan comprises a chitosan of the following formula (I):
  • n is an integer between 20 and 6000;
  • each R 1 is independently selected for each occurrence from hydrogen, acetyl, and either:
  • R 2 is hydrogen or amino
  • R 3 is amino, guanidino, C 1 -C 6 alkyl substituted with an amino or guanidino moiety, or a natural or unnatural amino acid side chain; or
  • R 1 substituents are H, at least 1% of R 1 substituents are acetyl, and at least 2% of R 1 substituents are a group of formula (II) or are taken together with the nitrogen to which they are attached to form a guanidine moiety.
  • the derivatized chitosan comprises of the following formula (I) wherein at least 90% by number or weight of R 1 moieties are as defined in formula (I) (e.g., at least about 95%, at least about 96%, at least about 97%, at least about 98%, or at least about 99%):
  • n is an integer between 20 and 6000;
  • each R 1 is independently selected for each occurrence from hydrogen, acetyl, and either:
  • R 2 is hydrogen or amino
  • R 3 is amino, guanidino, C 1 -C 6 alkyl substituted with an amino or guanidino moiety, or a natural or unnatural amino acid side chain; or
  • R 1 substituents are H, at least 1% of R 1 substituents are acetyl, and at least 2% of R 1 substituents are a group of formula (II) or are taken together with the nitrogen to which they are attached to form a guanidine moiety.
  • R 1 substituents are hydrogen.
  • R 1 substituents are hydrogen.
  • R 1 substituents are acetyl.
  • R 1 substituents are acetyl.
  • R 1 substituents are a group of formula (II).
  • R 1 substituents are a group of formula (II).
  • R 1 substituents are hydrogen, 4-20% of R 1 substituents are acetyl, 4-30% of R 1 substituents are a group of formula (II).
  • R 2 is amino and R 3 is an arginine side chain.
  • R 1 is selected from one of the following:
  • R 2 is amino and R 3 is a lysine side chain.
  • R 1 is selected from one of the following:
  • R 2 is amino and R 3 is a histidine side chain.
  • R 1 is selected from one of the following:
  • At least 1% of R 1 substituents are selected from one of the following:
  • R 1 substituents are selected from the following:
  • R 2 is amino and R 3 is a substituted C 1 -C 6 alkyl.
  • R 3 is C 1 -C 6 alkyl substituted with an amino group.
  • R 3 is C 1 alkyl substituted with an amino group.
  • R 3 is C 2 alkyl substituted with an amino group.
  • R 3 is C 3 alkyl substituted with an amino group.
  • R 3 is C 4 alkyl substituted with an amino group.
  • R 3 is C 5 alkyl substituted with an amino group.
  • R 3 is C 6 alkyl substituted with an amino group.
  • R 1 is selected from one of the following:
  • R 3 is C 1 -C 6 alkyl substituted with a guanidino group.
  • R 3 is C 1 alkyl substituted with a guanidino group.
  • R 3 is C 2 alkyl substituted with a guanidino group.
  • R 3 is C 3 alkyl substituted with a guanidino group.
  • R 3 is C 4 alkyl substituted with a guanidino group.
  • R 3 is C 5 alkyl substituted with a guanidino group.
  • R 3 is C 6 alkyl substituted with a guanidino group.
  • R 1 is selected from one of the following:
  • R 2 is amino that is substituted with a nitrogen protecting group prior to substitution on chitosan and removed subsequent to substitution on chitosan.
  • the nitrogen protecting group is tert-butyloxycarbonyl (Boc).
  • a nitrogen protecting group is used, which can provide an intermediate polymer having a nitrogen protecting group such as Boc.
  • R 2 is amino
  • R 2 is hydrogen and R 3 is amino.
  • R 2 is hydrogen and R 3 is guanidino.
  • R 2 is hydrogen and R 3 is a substituted C 1 -C 6 alkyl.
  • R 3 is C 1 -C 6 alkyl substituted with an amino group.
  • R 3 is C 1 alkyl substituted with an amino group.
  • R 3 is C 2 alkyl substituted with an amino group.
  • R 3 is C 3 alkyl substituted with an amino group.
  • R 3 is C 4 alkyl substituted with an amino group.
  • R 3 is C 5 alkyl substituted with an amino group.
  • R 3 is C 6 alkyl substituted with an amino group.
  • R 1 is selected from one of the following:
  • R 3 is C 1 -C 6 alkyl substituted with a guanidino group.
  • R 3 is C 1 alkyl substituted with a guanidino group.
  • R 3 is C 2 alkyl substituted with a guanidino group.
  • R 3 is C 3 alkyl substituted with a guanidino group.
  • R 3 is C 4 alkyl substituted with a guanidino group.
  • R 3 is C 5 alkyl substituted with a guanidino group.
  • R 3 is C 6 alkyl substituted with a guanidino group.
  • R 1 is selected from one of the following:
  • R 1 substituents are H, at least 1% of R 1 substituents are acetyl, and at least 2% of R 1 substituents independently selected from any of the formulae specifically shown above.
  • the functionalized chitosan of formula (I) may be further derivatized on the free hydroxyl moieties.
  • the molecular weight of the functionalized chitosan is between 5,000 and 1,000,000 Da.
  • the molecular weight of the functionalized chitosan is between 10,000 and 350,000 Da.
  • the molecular weight of the functionalized chitosan is between 10,000 and 60,000 Da.
  • the molecular weight of the functionalized chitosan is between 15,000 and 45,000 Da.
  • the molecular weight of the functionalized chitosan is between 15,000 and 35,000 Da.
  • the molecular weight of the functionalized chitosan is between 15,000 and 25,000 Da.
  • the functionalized chitosan is soluble in aqueous solution between pH 6 and 8.
  • the functionalized chitosan is soluble in aqueous solution between pH 6.8 and pH 7.4.
  • the chitosan is functionalized at between 5% and 50%.
  • the chitosan is functionalized at between 20% and 30%.
  • the degree of deacetylation (% DDA) of the derivatized chitosan is between 75% and 95%.
  • the degree of deacetylation (% DDA) of the derivatized chitosan is between 80% and 90%.
  • the polydispersity index (PDI) of the derivatized chitosan is between 1.0 and 2.5.
  • the polydispersity index (PDI) of the derivatized chitosan is between 1.2 and 1.8.
  • the functionalized chitosan is substantially free of other impurities.
  • the invention features a method of treating a wound in a subject, the method comprising applying a wound dressing comprising an effective amount of a composition comprising a soluble or derivatized chitosan to the wound, thereby treating the wound.
  • the composition reduces the healing time or increases the healing rate of the wound. In some embodiments, the composition decreases the inflammation associated with wound or healing of the wound.
  • the subject is a human, an animal (e.g., a farm, circus, zoo animal, or a companion pet).
  • an animal e.g., a farm, circus, zoo animal, or a companion pet.
  • the subject has a chronic disease.
  • the chronic disease is selected from the group consisting of inflammatory bowel disease (IBD) (e.g., Crohn's disease), diabetes (e.g., diabetes mellitus types 1 or type 2), chronic kidney disease (CKD), chronic obstructive pulmonary disease (COPD), hypothyroidism, multiple sclerosis, rheumatoid arthritis, hepatic encephalopathy, peritonitis, periodontitis, sinusitis, rhinitis, sepsis, and systemic lupus erythematosus.
  • IBD inflammatory bowel disease
  • diabetes e.g., diabetes mellitus types 1 or type 2
  • COPD chronic obstructive pulmonary disease
  • hypothyroidism e.g., multiple sclerosis, rheumatoid arthritis, hepatic encephalopathy, peritonitis, periodontitis, sinusitis, rhinitis, sepsis, and systemic lupus ery
  • the subject has been treated or is being treated with one or more of the cancer therapies, e.g., chemotherapy or radiation therapy.
  • the composition is administered to the subject before, during, or after the subject is treated with the cancer therapy.
  • the composition is administered to the subject prior to the therapy, e.g., for at least about 1 day, 2 days, 3 days, 5 days, or 1 week.
  • the composition is administered to the subject less than about 1 day, 2 days, 4 days, 1 week, 2 weeks, 3 weeks, or 4 weeks after the subject is treated with the cancer therapy.
  • the subject has been treated or is being treated with immunosuppressive therapy.
  • the composition is administered to the subject prior to the therapy, e.g., for at least about 1 day, 2 days, 3 days, 5 days, or 1 week.
  • the wound is caused by e.g., chemotherapy, radiation therapy, immunosuppressive therapy, chemical damage, biological damage, radiological damage, or immunodeficiency or compromise of immune system (e.g., primary immunodeficiency or acquired immunodeficiency (e.g., AIDS, malnutrition, aging, particular medications (e.g. chemotherapy, disease-modifying antirheumatic drugs, immunosuppressive drugs after organ transplants, glucocorticoids)).
  • the wound is the result of an infection, e.g., bacterial or viral infection, and wherein the infection is no longer present when the wound is treated.
  • an infection e.g., bacterial or viral infection
  • the wound is the result of an infection, e.g., bacterial or viral infection, and wherein the infection is still present when the wound is treated.
  • an infection e.g., bacterial or viral infection
  • the wound is an acute wound.
  • the wound is a chronic wound, e.g., a wound that does not heal in an orderly set of stages, in a predictable amount of time, or within three months.
  • the wound is a surgical wound, e.g., a wound resulted from medical grafting (e.g., skin or bone grafting) at the donor site and/or the graft site, full thickness or partial thickness excision.
  • the wound is a burn wound.
  • the wound is in the epidermis, dermis or hypodermis. In an embodiment, the wound is in the mucosal membrane.

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US11717532B2 (en) 2010-04-06 2023-08-08 Synedgen, Inc. Methods and compositions for treating wounds utilizing chitosan compounds
US20200061192A1 (en) * 2012-03-05 2020-02-27 Synedgen, Inc. Derivatized polyglucosamines for delivery of small molecules, peptides, and proteins
US20190142861A1 (en) * 2012-09-20 2019-05-16 Synedgen, Inc. Methods for treatment or prevention of damage resulting from radiation, trauma or shock
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US20160022564A1 (en) * 2013-03-12 2016-01-28 Synedgen, Inc. Oral formulation of polyglucosamine derivatives in combination with a non-fermentable sugar
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US20230181623A1 (en) * 2013-03-15 2023-06-15 Synedgen, Inc. Compositions and methods of use for wound healing
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US20230021050A1 (en) * 2016-03-16 2023-01-19 Synedgen, Inc. Compositions and methods of their use
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